Thomas L. Davis Geologist is a consulting firm involved in making geologic maps of the surface and subsurface, 3D models that integrate these maps and additional data, and assisting our clients better understand and unravel the structural complexity of their areas of interest. Our maps and models are constructed from various data sets such as oil and gas wells, water wells, seismic reflection and gravity data, remote sensing, and existing geologic mapping and cross sections. We have been making geologic maps, even in remote areas with no previous mapping, for over 30 years in both domestic (USA) and overseas settings. Our map products and analyses, some available on this web page (Downloads for Free\Publications & Reports), are used in a variety of endeavors including resource exploration and development such as oil and gas and mining, earthquake hazard mapping, assessment and remediation of environmental issues, evaluation and operation of natural-gas storage fields, groundwater studies, and flood risk management. 

In-house we maintain an extensive data base of scanned and paper geologic maps, geologic maps in GIS format, a well log data base of over 100,000 wells (in .LAS format), digital and paper cross sections, and publicly available geophysical data. Our workstation mapping efforts employ a variety of software programs such as Petra, Kingdom, various GIS platforms such as ArcMAP, MapInfo, and Global Mapper, and various structural geology programs. Project studies are delivered as digitally drafted images, digital project files, reports, and various paper products. Davis leads geologic field trips in southern and central California, California's Mojave Desert, and Nevada. Davis' past professional society trips have been through the AAPG (American Association of Petroleum Geologists), PS-AAPG (Pacific Section- American Association of Petroleum Geologists), and GSA (Geologic Society of America), and several of the field trip guidebooks are available on this web page. Customized geologic field trips for individuals, organizations, and companies can be arranged by contacting us.  Davis teaches a course that combines topographic and geologic map reading with compass and gps knowledge to various hiking and outdoors groups. Davis has a research and publication history in complex structural settings dealing with hydrocarbon exploration and earthquake hazard mapping, and has worked, worldwide as a consultant and researcher for numerous energy companies, several national oil companies, the United States Geological Survey (USGS), Playa Vista development, and Southern California Gas Company. Formerly Davis was a senior partner in Davis & Namson Consulting Geologists managing the map making efforts and business, and developing exploration prospects. Prior to that Davis worked for the Atlantic-Richfield Corporation as an exploration and new venture geologist in the western US, Alaska, and overseas.

Davis has a BS and PhD from the University of California completing a dissertation in 1983 on the Late Cenozoic Structure and Tectonic History of the Western "Big Bend" of the San Andreas fault and Adjacent San Emigdio Mountains. In two papers published in 1988, Namson and Davis showed that the destructive 1983 Coalinga earthquake was caused by a previously unknown blind thrust fault and more generally that California's subsurface geology needed to be integrated with surface geology to have a more complete understanding of the State's earthquake hazard and risk (these papers are Seismically Active Fold and Thrust Belt in the San Joaquin Valley, Central California; and Structural Transect of the Western Transverse Ranges, California: Implications for Lithospheric Kinematics and Seismic Risk Evaluation). In 1989 Davis, Namson, and Yerkes were the first to show that the northern Los Angeles basin was underlain by an active blind thrust fault system (Elysian Park) and a splay fault of this system caused the destructive 1987 Whittier Narrow earthquake (A Cross Section of The Los Angeles Area; Seismically Active Fold And Thrust Belt, The 1987 Whittier Narrows Earthquake, and Earthquake Hazard). Davis and Namson's approach was unique from previous California earthquake evaluations as it emphasized integrating surface and subsurface geology and using interpretative mapping techniques, software, and data used almost exclusively by the oil and gas industry to fully understand the geology of an area. Using this approach Davis and Namson explained in a paper published in Nature that the 1994 Northridge earthquake was caused by the Pico thrust-a previously unknown active fault (A Balanced Cross-Section of the 1994 Northridge Earthquake, Southern California). Since 2008 Thomas L. Davis Geologist has continued emphasizing to the geologic community the need to integrate surface and subsurface geologic mapping, and doing pro-bono research on active fault mapping, petroleum geology, and structural geology in southern and central California. The fore mentioned publications and field guidebooks are available on this web page (Downloads for Free\Publications & Reports).
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3D model of a southern California oil field. Top layer is the topographic surface, steeply inclined layers such as the purple surface are faults, stack of horizontal layers in the middle are the tops of formations, and green vertical lines are oil and gas well boreholes.

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Thomas L. Davis (Thom)

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Thom Davis field mapping in the Duki Block (100 km east of Quetta), Baluchistan, Pakistan.

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