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Applications of machine learning in earth sciences include geological mapping, gas leakage detection and geological features identification. Machine learning (ML) is a type of artificial intelligence (AI) that enables computer systems to classify, cluster, identify and analyze vast and complex sets of data while eliminating the need for explicit instructions and programming.[1] Earth science is the study of the origin, evolution, and future[2] of the planet Earth. The Earth system can be subdivided into four major components including the solid earth, atmosphere, hydrosphere and biosphere.[3]

A variety of algorithms may be applied depending on the nature of the earth science exploration. Some algorithms may perform significantly better than others for particular objectives. For example, convolutional neural networks (CNN) are good at interpreting images, artificial neural networks (ANN) perform well in soil classification[4] but more computationally expensive to train than support-vector machine (SVM) learning. The application of machine learning has been popular in recent decades, as the development of other technologies such as unmanned aerial vehicles (UAVs),[5] ultra-high resolution remote sensing technology and high-performance computing units[6] lead to the availability of large high-quality datasets and more advanced algorithms.

Significance

Complexity of earth science

Problems in earth science are often complex.[7] It is difficult to apply well-known and described mathematical models to the natural environment, therefore machine learning is commonly a better alternative for such non-linear problems.[8] Ecological data are commonly non-linear and consist of higher-order interactions, and together with missing data, traditional statistics may underperform as unrealistic assumptions such as linearity are applied to the model.[9][10] A number of researchers found that machine learning outperforms traditional statistical models in earth science, such as in characterizing forest canopy structure,[11] predicting climate-induced range shifts,[12] and delineating geologic facies.[13] Characterizing forest canopy structure enables scientists to study vegetation response to climate change.[14] Predicting climate-induced range shifts enable policy makers to adopt suitable conversation method to overcome the consequences of climate change.[15] Delineating geologic facies helps geologists to understand the geology of an area, which is essential for the development and management of an area.[16]

Inaccessible data

In Earth Sciences, some data are often difficult to access or collect, therefore inferring data from data that are easily available by machine learning method is desirable.[10] For example, geological mapping in tropical rainforests is challenging because the thick vegetation cover and rock outcrops are poorly exposed.[17] Applying remote sensing with machine learning approaches provides an alternative way for rapid mapping without the need of manually mapping in the unreachable areas.[17]

Reduce time costs

Machine learning can also reduce the efforts done by experts, as manual tasks of classification and annotation etc are the bottlenecks in the workflow of the research of earth science.[10] Geological mapping, especially in a vast, remote area is labour, cost and time-intensive with traditional methods.[18] Incorporation of remote sensing and machine learning approaches can provide an alternative solution to eliminate some field mapping needs.[18]

Consistent and bias-free

Consistency and bias-free is also an advantage of machine learning compared to manual works by humans. In research comparing the performance of human and machine learning in the identification of dinoflagellates, machine learning is found to be not as prone to systematic bias as humans.[19] A recency effect that is present in humans is that the classification often biases towards the most recently recalled classes.[19] In a labelling task of the research, if one kind of dinoflagellates occurs rarely in the samples, then expert ecologists commonly will not classify it correctly.[19] The systematic bias strongly deteriorate the classification accuracies of humans.[19]

Optimal machine learning algorithm

The extensive usage of machine learning in various fields has led to a wide range of algorithms of learning methods being applied. The machine learning algorithm applied in solving earth science problem in much interest to the researchers.[20][4][7] Choosing the optimal algorithm for a specific purpose can lead to a significant boost in accuracy.[21] For example, the lithological mapping of gold-bearing granite-greenstone rocks in Hutti, India with AVIRIS-NG hyperspectral data, shows more than 10% difference in overall accuracy between using Support Vector Machine (SVM) and random forest.[22] Some algorithms can also reveal some important information. 'White-box models' are transparent models in which the results and methodologies can be easily explained, while 'black-box' models are the opposite.[21] For example, although the support-vector machine (SVM) yielded the best result in landslide susceptibility assessment accuracy, the result cannot be rewritten in the form of expert rules that explain how and why an area was classified as that specific class.[7] In contrast, the decision tree has a transparent model that can be understood easily, and the user can observe and fix the bias if any present in the model.[7] If the computational power is a concern, a more computationally demanding learning method such as artificial neural network is less preferred despite the fact that artificial neural network may slightly outperform other algorithms, such as in soil classification.[4]

Below are highlights of some commonly applied algorithms.[23]

Usage

Mapping

Geological or lithological mapping and mineral prospectivity mapping

Geological or lithological mapping produces maps showing geological features and geological units. Mineral prospectivity mapping utilizes a variety of datasets such as geological maps, aeromagnetic imagery, etc to produce maps that are specialized for mineral exploration. Geological/ Lithological Mapping and Mineral Prospectivity Mapping can be carried out by processing the data with machine-learning techniques with the input of spectral imagery obtained from remote sensing and geophysical data.[25] Spectral imagery is the imaging of selected electromagnetic wavelength bands in the electromagnetic spectrum, while conventional imaging captures three wavelength bands (Red, Green, Blue) in the electromagnetic spectrum.[26] Random Forest and Support Vector Machine (SVM) etc are common algorithms being used with remote sensed geophysical data, while Simple Linear Iterative Clustering-Convolutional Neural Network (SLIC-CNN)[5] and Convolutional Neural Networks (CNN)[18] etc are commonly applied while dealing with aerial photos and images. Large scale mapping can be carried out with geophysical data from airborne and satellite remote sensing geophysical data,[22] and smaller-scale mapping can be carried out with images from Unmanned Aerial Vehicle (UAV) for higher resolution.[5]

Vegetation cover is one of the major obstacles for geological mapping with remote sensing, as reported in various research, both in large-scale and small-scale mapping. Vegetation affects the quality of spectral image[25] or obscures the rock information in the aerial images.[5]

Examples of application in Geological/ Lithological Mapping and Mineral Prospectivity Mapping
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Lithological Mapping of Gold-bearing granite-greenstone rocks[22] AVIRIS-NG hyperspectral data Hutti, India Linear Discriminant Analysis (LDA),

Random Forest,

Support Vector Machine (SVM)

Support Vector Machine (SVM) outperforms the other Machine Learning Algorithms (MLAs)
Lithological Mapping in the Tropical Rainforest[17] Magnetic Vector Inversion,

Ternary RGB map,

Shuttle Radar Topography Mission (SRTM),

False color (RGB) of Landsat 8 combining bands 4, 3 and 2

Cinzento Lineament, Brazil Random Forest Two predictive maps were generated:

(1) Map generated with remote sensing data only has a 52.7% accuracy when compared to the geological map, but several new possible lithological units are identified

(2) Map generated with remote sensing data and spatial constraints has a 78.7% accuracy but no new possible lithological units are identified

Geological Mapping for mineral exploration[27] Airborne polarimetric Terrain Observation with Progressive Scans SAR (TopSAR),

geophysical data

Western Tasmania Random Forest Low reliability of TopSAR for geological mapping, but accurate with geophysical data.
Geological and Mineralogical mapping[citation needed] Multispectral and hyperspectral satellite data Central Jebilet,

Morocco

Support Vector Machine (SVM) The accuracy of using hyperspectral data for classifying is slightly higher than that using multispectral data, obtaining 93.05% and 89.24% respectively, showing that machine learning is a reliable tool for mineral exploration.
Integrating Multigeophysical Data into a Cluster Map[28] Airborne magnetic,

frequency electromagnetic, radiometric measurements,

ground gravity measurements

Trøndelag, Mid-Norway Random Forest The cluster map produced has a satisfactory relationship with the existing geological map but with minor misfits.
High-Resolution Geological Mapping with Unmanned Aerial Vehicle (UAV)[5] Ultra-resolution RGB images Taili waterfront,

Liaoning Province,

China

Simple Linear Iterative Clustering-Convolutional Neural Network (SLIC-CNN) The result is satisfactory in mapping major geological units but showed poor performance in mapping pegmatites, fine-grained rocks and dykes. UAVs were unable to collect rock information where the rocks were not exposed.
Surficial Geology Mapping[18]

Remote Predictive Mapping (RPM)

Aerial Photos,

Landsat Reflectance,

High-Resolution Digital Elevation Data

South Rae Geological Region,

Northwest Territories,

Canada

Convolutional Neural Networks (CNN),

Random Forest

The resulting accuracy of CNN was 76% in the locally trained area, while 68% for an independent test area. The CNN achieved a slightly higher accuracy of 4% than the Random Forest.
Methods of Splitting of the Datasets into Training Dataset and Testing Dataset
As the training of machine learning for landslide susceptibility mapping requires both training and testing dataset, therefore splitting of the dataset is required. Two splitting methods for the datasets are presented on the geologic map of the east Cumberland Gap. The method presented on the left, 'Splitting into two adjacent areas' is more useful as the automation algorithm can carry out mapping of a new area with the input of expert processed data of adjacent land. The cyan coloured pixels show the training dataset while the remaining shows the testing datasets.

Landslide susceptibility and hazard mapping

Landslide susceptibility refers to the probability of landslide of a place, which is affected by the local terrain conditions.[29] Landslide susceptibility mapping can highlight areas prone to landslide risks which are useful for urban planning and disaster management works.[7] Input dataset for machine learning algorithms usually includes topographic information, lithological information, satellite images, etc. and some may include land use, land cover, drainage information, vegetation cover[7][30][31][32] according to their study needs. In machine learning training for landslide susceptibility mapping, training and testing datasets are required.[7] There are two methods of allocating datasets for training and testing, one is to random split the study area for the datasets, another is to split the whole study into two adjacent parts for the two datasets. To test the classification models, the common practice is to split the study area randomly into two datasets,[7][33] however, it is more useful that the study area can be split into two adjacent parts so that the automation algorithm can carry out mapping of a new area with the input of expert processed data of adjacent land.[7]

Examples of application in Landslide Susceptibility/ Hazard Mapping
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Landslide Susceptibility Assessment[7] Digital Elevation Model (DEM),

Geological Map,

30m Landsat Imagery

Fruška Gora Mountain,

Serbia

Support Vector Machine (SVM),

Decision Trees,

Logistic Regression

Support Vector Machine (SVM) outperforms the others
Landslide Susceptibility Mapping[33] ASTER satellite-based geomorphic data,

geological maps

Honshu Island,

Japan

Artificial Neural Network (ANN) Accuracy greater than 90% for determining the probability of landslide.
Landslide Susceptibility Zonation through ratings[30] Spatial data layers with

slope,

aspect,

relative relief,

lithology,

structural features,

land use,

land cover,

drainage density

Parts of Chamoli and Rudraprayag districts of the State of Uttarakhand,

India

Artificial Neural Network (ANN) The AUC of this approach reaches 0.88. This approach generated an accurate assessment of landslide risks.
Regional Landslide Hazard Analysis[31] Topographic slope,

topographic aspect,

topographic curvature, distance from drainage,

lithology,

distance from lineament,

land cover from TM satellite images,

Vegetation index (NDVI),

precipitation data

The eastern part of Selangor state,

Malaysia

Artificial Neural Network (ANN) The approach achieved 82.92% accuracy of prediction.

Feature identification and detection

Data Augmentation Technique
In the preparation of the dataset for the recognition of rock fractures, data augmentation was carried out. This technique is commonly used for increasing the training dataset size. Although the randomly cropped samples and the flipping samples come from the same image, the processed samples are unique to the learning. This technique can prevent the problem of data scarcity and the overfitting problem of the model.

Discontinuity analyses

Discontinuities such as a fault plane, bedding plane etc have important implications in engineering.[34] Rock fractures can be recognized automatically by machine learning through photogrammetric analysis even with the presence of interfering objects, for example, foliation, rod-shaped vegetation, etc.[35] In machine training for classifying images, data augmentation is a common practice to avoid overfitting and increase the training dataset.[35] For example, in a research of recognizing rock fractures, 68 images for training and 23 images for the testing dataset were prepared by random splitting.[35] Data augmentation was then carried out and the training dataset was increased to 8704 images by flip and random crop.[35] The approach was able to recognize the rock fractures accurately in most cases.[35] The Negative Prediction Value (NPV) and the Specificity were over 0.99.[35] This demonstrated the robustness of discontinuity analyses with machine learning.

Examples of application in Discontinuity Analyses
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Recognition of Rock Fractures[35] Rock images collected in field survey Gwanak Mountain and Bukhan Mountain,

Seoul,

Korea

and

Jeongseon-gun, Gangwon-do,

Korea

Convolutional Neural Network (CNN) The approach was able to recognize the rock fractures accurately in most cases. The Negative Prediction Value (NPV) and the Specificity are over 0.99.

Carbon dioxide leakage detection

Quantifying carbon dioxide leakage from a geologic sequestration site has been gaining increasing attention as the public is interested in whether carbon dioxide is stored underground safely and effectively.[36] A geologic sequestration site is to capture greenhouse gas and bury deep underground in the geological formations. Carbon dioxide leakage from a geologic sequestration site can be detected indirectly by planet stress response with the aid of remote sensing and an unsupervised clustering algorithm (Iterative Self-Organizing Data Analysis Technique (ISODATA) method).[37] The increase in soil CO2 concentration causes a stress response for the plants by inhibiting plant respiration as oxygen is displaced away by carbon dioxide.[38] The stress signal by the vegetation can be detected with the Red Edge Index (REI).[38] The hyperspectral images are processed by the unsupervised algorithm clustering pixels with similar plant responses.[38] The hyperspectral information in areas with known CO2 leakage was extracted so that areas with CO2 leakage can be matched with the clustered pixels with spectral anomalies.[38] Although the approach can identify CO2 leakage efficiently, there are some limitations that require further study.[38] The Red Edge Index (REI) may not be accurate due to reasons like higher chlorophyll absorption, variation in vegetation, and shadowing effects therefore some stressed pixels were incorrectly identified as healthy pixels.[38] Seasonality, groundwater table height may also affect the stress response to CO2 of the vegetation.[38]

Examples of application in Carbon Dioxide Leakage Detection
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Detection of CO2 leak from a geologic sequestration site[37] Aerial hyperspectral imagery The Zero Emissions Research and Technology (ZERT),

US

Iterative Self-Organizing Data Analysis Technique (ISODATA) method The approach was able to detect areas with CO2 leak,s however other factors like the growing seasons of the vegetation also interfere with the results.

Quantification of water inflow

The Rock Mass Rating (RMR) System[39] a world-wide adopted rock mass classification system by geomechanical means with the input of six parameters. The amount of water inflow is one of the inputs of the classification scheme, representing the groundwater condition. Quantification of the water inflow in the faces of a rock tunnel was traditionally carried out by visual observation in the field, which is labour and time consuming with safety concerns.[40] Machine learning can determine the water inflow by analyzing images taken in the construction site.[40] The classification of the approach mostly follows the RMR system but combining damp and wet state as its difficult to distinguish only by visual inspection.[40][39] The images were classified into the non-damage state, wet state, dripping state, flowing state and gushing state.[40] The accuracy of classifying the images was about 90%.[40]

Examples of application in Quantification of Water Inflow
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Quantification of water inflow in rock tunnel faces[40] Images of water inflow - Convolutional Neural Network (CNN) The approach achieved an average accuracy of 93.01%.

Classification

Soil classification

The most popular cost-effective method for soil investigation method is by Cone Penetration Testing (CPT).[41] The test is carried out by pushing a metallic cone through the soil and the force required to push at a constant rate is recorded as a quasi-continuous log.[4] Machine learning can classify soil with the input of Cone Penetration Test log data.[4] In an attempt to classify with machine learning, there are two parts of tasks required to analyse the data, which are the segmentation and classification parts.[4] The segmentation part can be carried out with the Constraint Clustering and Classification (CONCC) algorithm to split a single series data into segments.[4] The classification part can be carried out by Decision Trees (DT), Artificial Neural Network (ANN), or Support Vector Machine (SVM).[4] While comparing the three algorithms, it is demonstrated that the Artificial Neural Network (ANN) performed the best in classifying humous clay and peat, while the Decision Trees performed the best in classifying clayey peat.[4] The classification by this method is able to reach very high accuracy, even for the most complex problem, its accuracy was 83%, and the incorrectly classified class was a geologically neighbouring one.[4] Considering the fact that such accuracy is sufficient for most experts, therefore the accuracy of such approach can be regarded as 100%.[4]

Examples of application in Soil Classification
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Soil classification[4] Cone Penetration Test (CPT) logs - Decision Trees,

Artificial Neural Network (ANN),

Support Vector Machine

The Artificial Neural Network (ANN) outperformed the others in classifying humous clay and peat, while the Decision Trees outperformed the others in classifying clayey peat. Support Vector Machine gave the poorest performance among the three.

Geological structure classification

Effect of Colour Image and Greyscale ImageThe figure shows an image of a fold. The left image shows a colour image, while the one in the right shows a grayscale image. The difference in the accuracy of classifying the geological structure between colour images and grayscale images is little.

Exposed geological structures like anticline, ripple marks, xenolith, scratch, ptygmatic folds, fault, concretion, mudcracks, gneissose, boudin, basalt columns and dike can be identified automatically with a deep learning model.[20] Research demonstrated that Three-layer Convolutional Neural Network (CNN) and Transfer Learning have great accuracy of about 80% and 90% respectively, while others like K-nearest neighbors (KNN), Artificial Neural Network (ANN) and Extreme Gradient Boosting (XGBoost) have low accuracies, ranges from 10% - 30%.[20] The grayscale images and colour images were both tested, and the accuracies difference is little, inferring that colour is not very important in identifying geological structures.[20]

Examples of application in Geological Structure Classification
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Geological structures classification[20] Images of geological structures - K nearest neighbors (KNN),

Artificial Neural Network (ANN),

Extreme Gradient Boosting (XGBoost),

Three-layer Convolutional Neural Network (CNN),

Transfer Learning

Three-layer Convolutional Neural Network (CNN) and Transfer Learning reached accuracies up to about 80% and 90% respectively, while others were relatively low, ranges from about 10% to 30%.

Forecast and predictions

Earthquake early warning systems and forecasting

Earthquake early warning systems are often vulnerable to local impulsive noise, therefore giving out false alerts.[42] False alerts can be eliminated by discriminating the earthquake waveforms from noise signals with the aid of machine learning methods. The method consists of two parts, the first part is unsupervised learning with Generative Adversarial Network (GAN) to learn and extract features of first arrival P-waves, and Random Forest to discriminate P-waves. The approach achieved 99.2% in recognizing P-waves and can avoid false triggers by noise signals with 98.4% accuracy.[42]

Laboratory earthquakes are produced in a laboratory setting to mimic real-world earthquakes. With the help of machine learning, the patterns of acoustical signals as precursors for earthquakes can be identified without the need of manually searching. Predicting the time remaining before failure was demonstrated in a research with continuous acoustic time series data recorded from a fault. The algorithm applied was Random Forest trained with about 10 slip events and performed excellently in predicting the remaining time to failure. It identified acoustic signals to predict failures, and one of them was previously unidentified. Although this laboratory earthquake produced is not as complex as that of earth, this makes important progress that guides further earthquake prediction work in the future.[43]

Examples of application in Earthquake Prediction
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Discriminating earthquake waveforms[42] Earthquake dataset Southern California and Japan Generative Adversarial Network (GAN),

Random Forest

The approach can recognise P waves with 99.2% accuracy and avoid false triggers by noise signals with 98.4% accuracy.
Predicting time remaining for next earthquake[43] Continuous acoustic time series data - Random Forest The R2 value of the prediction reached 0.89, which demonstrated excellent performance.

Streamflow discharge prediction

Real-time streamflow data is integral for decision making, for example, evacuations, regulation of reservoir water levels during a flooding event.[44] Streamflow data can be estimated by information provided by streamgages which measures the water level of a river. However, water and debris from a flooding event may damage streamgages and essential real-time data will be missing. The ability of machine learning to infer missing data[10] enables it to predict streamflow with both historical streamgages data and real-time data. SHEM is a model that refers to Streamflow Hydrology Estimate using Machine Learning[45] that can serve the purpose. To verify its accuracies, the prediction result was compared with the actual recorded data and the accuracies were found to be between 0.78 to 0.99.

Examples of application in Streamflow Discharge Prediction
Objective Input dataset Location Machine Learning Algorithms (MLAs) Performance
Streamflow Estimate with data missing[45] Streamgage data from NWIS-Web Four diverse watersheds in Idaho and Washington,

US

Random Forests The estimates correlated well to the historical data of the discharges. The accuracy ranges from 0.78 to 0.99.

Challenge

Inadequate training data

An adequate amount of training and validation data is required for machine learning.[10] However, some very useful products like satellite remote sensing data only have decades of data since the 1970s. If one is interested in the yearly data, then only less than 50 samples are available.[46] Such amount of data may not be adequate. In a study of automatic classification of geological structures, the weakness of the model is the small training dataset, even though with the help of data augmentation to increase the size of the dataset.[20] Another study of predicting streamflow found that the accuracies depend on the availability of sufficient historical data, therefore sufficient training data determine the performance of machine learning.[45] Inadequate training data may lead to a problem called overfitting. Overfitting causes inaccuracies in machine learning[47] as the model learns about the noise and undesired details.

Limited by data input

Machine learning cannot carry out some of the tasks as a human does easily. For example, in the quantification of water inflow in rock tunnel faces by images for Rock Mass Rating system (RMR),[40] the damp and the wet state was not classified by machine learning because discriminating the two only by visual inspection is not possible. In some tasks, machine learning may not able to fully substitute manual work by a human.

Black-box operation

Black-box Operation of some Machine Learning Algorithms
In a black-box operation, a user only know about the input and output but not the process. Artificial Neural Network (ANN) is an example of a black-box operation. The user has no way to understand the logic of the hidden layers.

In many machine learning algorithms, for example, Artificial Neural Network (ANN), it is considered as 'black box' approach as clear relationships and descriptions of how the results are generated in the hidden layers are unknown.[48] 'White-box' approach such as decision tree can reveal the algorithm details to the users.[49] If one wants to investigate the relationships, such 'black-box' approaches are not suitable. However, the performances of 'black-box' algorithms are usually better.[50]

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