Janet Watt
My research focuses on characterizing onshore/offshore geologic structure, deformation, and active tectonics to address problems focused on geologic hazards and framework geologic processes. My recent work involves the development and application of integrative geophysical approaches to 3D characterization of faults and fault interactions.
I received my M.S. in Marine Science (Geological Oceanography) from Moss Landing Marine Laboratories while working at the USGS in Menlo Park, CA. As part of the Geophysical Unit of Menlo Park (GUMP), I used potential-field methods (gravity and magnetics) and 3D geologic mapping to understand earthquake and volcano hazards, and mineral and water resources in the western U.S. In 2010, I returned to my marine geology roots and joined the Pacific Coastal and Marine Science Center in Santa Cruz, CA where I currently work as a Research Geophysicist.
Selected Media and Public Outreach
November 18, 2016, CBS This Morning "California prepares for next big earthquake"
October 19, 2016, Popular Mechanics "Two dangerous Fault Lines Under San Francisco Are Connected, Study Finds"
February 1, 2016, Temblor.net Earthquake News & Blog, "Why don't the earthquakes line up with the San Andreas fault?"
January 2, 2016, CBS NEWS, "Alarming Discovery Shows Bay Area’s 2 Most Dangerous Earthquake Faults May Be Connected"
December 31, 2015, San Francisco Chronicle, "New data on 2 Bay Area faults cause worry about next big quake"
November 20, 2014, KQED Science "Using 3D Visualization, Geologists Explore the Complex Areas Where Faults Join and Split"
Science and Products
Geophysical framework investigations influencing ground-water resources in east-central Nevada and west-central Utah, with a section on geologic and geophysical basin by basin descriptions
Principal Facts of Gravity data in the Northern Willamette Valley and Vicinity, Northwestern Oregon and Southwestern Washington
Geophysical Investigations of the Smoke Creek Desert and their Geologic Implications, Northwest Nevada and Northeast California
Gravity, magnetic, and physical property data in the Smoke Creek Desert area, northwest Nevada
Preliminary isostatic gravity map of the Sonoma volcanic field and vicinity, Sonoma and Napa Counties, California
Resistivity imaging in eastern Nevada Using the audiomagnetotelluric method for hydrogeologic framework studies
Gravity and magnetic data along a seismic refraction-reflection line in northwest Nevada and northeast California
Science and Products
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Geophysical framework investigations influencing ground-water resources in east-central Nevada and west-central Utah, with a section on geologic and geophysical basin by basin descriptions
A geophysical investigation was undertaken as part of an effort to characterize the geologic framework influencing ground-water resources in east-central Nevada and west-central Utah. New gravity data were combined with existing aeromagnetic, drill-hole, and geologic data to help determine basin geometry, infer structural features, estimate depth to pre-Cenozoic basement rocks, and further constraAuthorsJanet T. Watt, David A. Ponce, Alan R. WallacePrincipal Facts of Gravity data in the Northern Willamette Valley and Vicinity, Northwestern Oregon and Southwestern Washington
Gravity data were collected from 2004 through 2006 to assist in mapping subsurface geology in the northern Willamette Valley and vicinity, northwestern Oregon and southwestern Washington. Prior to this effort to improve the gravity data coverage in the study area, very little regional data were available. This report gives the principle facts for 2710 new gravity stations and 1446 preexisting gravAuthorsRobert L. Morin, Karen L. Wheeler, Darcy McPhee, Philip A. Dinterman, Janet T. WattGeophysical Investigations of the Smoke Creek Desert and their Geologic Implications, Northwest Nevada and Northeast California
The Smoke Creek Desert is a large basin about 100 km (60 mi) north of Reno near the California-Nevada border, situated along the northernmost parts of the Walker Lane Belt, a physiographic region defined by diverse topographic expression consisting of northweststriking topographic features and strike-slip faulting. Because geologic and geophysical framework studies play an important role in undersAuthorsDavid A. Ponce, Jonathan M. G. Glen, Janet E. TildenGravity, magnetic, and physical property data in the Smoke Creek Desert area, northwest Nevada
The Smoke Creek Desert, located approximately 100 km (60 mi) north of Reno near the California-Nevada border, is a large basin situated along the northernmost parts of the Walker Lane Belt (Stewart, 1988), a physiographic province defined by northwest-striking topographic features and strike-slip faulting. Because geologic framework studies play an important role in understanding the hydrology ofAuthorsJanet E. Tilden, David A. Ponce, Jonathan M. G. Glen, Bruce A. Chuchel, Kira Tushman, Alison DuvallPreliminary isostatic gravity map of the Sonoma volcanic field and vicinity, Sonoma and Napa Counties, California
This isostatic residual gravity map is part of a three-dimensional mapping effort focused on the subsurface distribution of rocks of the Sonoma volcanic field in Napa and Sonoma counties, northern California. This map will serve as a basis for modeling the shapes of basins beneath the Santa Rosa Plain and Napa and Sonoma Valleys, and for determining the location and geometry of faults within the aAuthorsV. E. Langenheim, C. W. Roberts, C.A. McCabe, D.K. McPhee, J. E. Tilden, R.C. JachensResistivity imaging in eastern Nevada Using the audiomagnetotelluric method for hydrogeologic framework studies
Inversion of audiomagnetotelluric (AMT) sounding data collected in eastern Nevada shows significant structure within the upper kilometer of the subsurface that defines the geologic framework from which hydrologic models will be developed. We collected AMT data along two profiles in Spring and Cave valleys in 2004–2005, using the Geometrics StrataGem EH4 system, a four‐channel, natural and controllAuthorsDarcy McPhee, Louise Pellerin, B. A. Churchel, Janet E. Tilden, Gary L. DixonGravity and magnetic data along a seismic refraction-reflection line in northwest Nevada and northeast California
No abstract available.AuthorsJanet E. Tilden, David A. Ponce, Jonathan M. G. Glen, Kathleen D. Gans - News