	DOUGLAS DREGER Assistant Professor of Geophysics
	Office: 283 McCone Hall Telephone: (510) 643-1719 Fax: (510) 643-9980 E-mail: dreger@seismo.berkeley.edu To Department home page To Seismo Lab home page

Research Interests | Projects | Academic Background | Graduate Students | Publications

Research Interests

Use of waveform data to investigate seismic source, wave propagation, and Earth structure problems. Study of historic earthquake seismograms. Development of robust automated procedures to analyze earthquakes as they occur and to report strong shaking levels on a local and regional scale. Study of seismic sources including earthquakes, nuclear explosions and exotic events. Develop realistic Earth structure models to explain observed strong motion data of recent large earthquakes and to predict the distribution of strong ground motions for future earthquakes. Current research is focussed on nuclear event discrimination using regional distance moment tensors, investigating anomalous seismic radiation of Mammoth Lakes, CA, events, the development of a regional distance methodology to rapidly determine near-source strong ground motion shaking levels, investigation of 3D crustal structure of the Mendocino Triple Junction region, and the development of a 3D Earth model of the greater San Francisco bay area.

Specific Research Projects

Three-dimensional wave propagation in the Greater SF Bay Area

Berkeley Seismological Laboratory Regional Moment Tensor Page

Historic Earthquakes (1952 Kern County Sequence)

Earthquake Source Processes

Comprehensive nuclear Test Ban Treaty Research

Academic Background

1992- Ph.D. Geophysics, California Institute of Technology
1989- M.S. geophysics, California Institute of Technology
1987- Geophysics, University of California, Riverside

Ph.D. and Master's Students

Wu Cheng Chi (current)
Christiane Stidham (current)
Michael Antolik (Ph.D. 1997: currently at Harvard University)
Janine Weber-Band (Ph.D. 1998: currently at Exponent, Menlo Park, CA )
Peggy Johnson (Ph.D. 1997: currently at USGS Pasadena)

Recent Publications

Dreger, D. and B. Woods (1998). Regional moment tensors as discriminants?, submitted to Bull. Seism. Soc. Am.

Kaverina, A., D. Dreger, and M. Antolik (1998). Source process of the 21 April, 1997, Santa Cruz Island Earthquake (Mw 7.8), in press Geophys. Res. Lett.

Dreger, D. and B. Savage (1998). Aftershocks of the 1952 Kern County, California, Earthquake Sequence, submitted to Bull. Seism. Soc. Am.

Fukuyama, E., M. Ishida, D. Dreger, and H. Kawai (1998), Automated Seismic Moment Tensor Determination by Using On-line Broadband Seismic Waveforms, Zishin, 51, 149-156 (in Japanese with English abstract).

Dreger, D., R. Uhrhammer, M. Pasyanos, J. Franck, and B. Romanowicz (1998), Regional and Far-Regional Earthquake Locations and Source Parameters using Sparse Broadband Networks: A Test on the Ridgecrest Sequence, in press Bull. Seism. Soc. Am.

Dreger, D. (1997), The Large Aftershocks of the Northridge Earthquake and their Relationship to Mainshock Slip and Fault Zone Complexity, Bull. Seism. Soc. Am., 87, 1259-1266

Antolik, M., D. Dreger, and B. Romanowicz (1996), Finite Fault Source Study of the Great 1994 Deep Bolivia Earthquake, Geophys Res. Lett., 23, 1589-1592.

Gee, L. S., D. S. Neuhauser, D. S. Dreger, M. Pasyanos, R. A. Uhrhammer, and B. Romanowicz (1996), Real-Time Seismology at UC Berkeley: The Rapid Earthquake Data Integration Project, Bull. Seism. Soc. Am., 86, 936-945.

Pasyanos, M. E., D. S. Dreger, and B. Romanowicz (1996), Towards Real-Time Determination of Regional Moment Tensors, Bull. Seism. Soc. Am., 86, 1255-1269

Dreger, D., J. Ritsema, and M. Pasyanos (1995), Broadband Analysis of the 21 September, 1993, Klamath Falls Earthquake Sequence, Geophys. Res. Lett., 22, 997-1000.

Hough, S. E., D. S. Dreger (1994), Source Parameters of the 4/22/92 M6.1 Joshua Tree, California Earthquake and its Aftershocks: Empirical Green's Function Analysis of GEOS and TERRAscope Data, Bull. Seism. Soc. Am., 85, 1576-1590.

Dreger, D. (1994), Empirical Green's Function Study of the January 17, 1994 Northridge, California Earthquake, Geophys. Res. Lett., 21, 2633-2636.

Dreger, D. S. (1994), Investigation of the Rupture Process of the 28 June 1992 Landers Earthquake Utilizing TERRAscope, Bull. Seism. Soc. Am., 84, 713-724.

Saikia, C. K., D. S. Dreger, and D. V. Helmberger (1994), Modeling of Energy Amplification Recorded within Greater Los Angeles Using Irregular Structure, Bull. Seism. Soc. Am., 84, 47-61.

Dreger, D. S., and D. V. Helmberger (1993), Determination of Source Parameters at Regional Distances with Single Station or Sparse Network Data, Journ. Geophys. Res., 98, 8107-8125.

Romanowicz, B. D. Dreger, M . Pasyanos, and R. Urhammer (1993). Monitoring of Strain Release in Central and Northern California Using Broadband Data, Geophys. Res. Let., 20, 1643-1646.

Helmberger, D., D. Dreger, R. Stead, and H. Kanamori (1993). Impact of Broadband Seismology on the Understanding of Strong Motions, Bull. Seism. Soc. Am., 83, 830-850.

Somerville, P., N. Smith, and D. Dreger (1993), Influence of Critical Moho Reflections on Strong Ground Motion Attenuation in California, Data Utilization Report CSMIP/93-01, 84 pp.

Dreger, D. S., and D. V. Helmberger (1992). Investigation of Two-Dimensional Wave Propagation in the Kanto Plain, CUREe-Kajima Research Project, California Institute of Technology, UCB EERC 340 c87.

Kanamori, H., H. Thio, D. Dreger, E. Hauksson, T. Heaton (1992). Initial Investigation of the Landers, California Earthquake of 28 June 1992 Using TERRAscope, Geophys. Res. Lett., 19 2267-2270.

Helmberger, D. V., L. S. Zhao, D. Dreger and V. LeFevre (1992). Exploration of the lower lithosphere; northeastern United States, Phys. Earth Plan. Int., 70 22-38.

Helmberger, D. V., R. Stead, P. Ho-Liu, and D. Dreger (1992). Broadband Modeling of Regional Seismograms; Imperial Valley to Pasadena, Geophys. J. Int., 110 42-54.

Dreger, D. S., and D. V. Helmberger (1991). Source Parameters of the Sierra Madre Earthquake from Regional and Local Body Waves, Geophys. Res. Let., 18 2015-2018.

Dreger, D. S., and D. V. Helmberger (1991). Complex Faulting Deduced from Broadband Modeling of the 28 February 1990 Upland Earthquake (ML=5.2), Bull. Seism. Soc. Am., 81 1129-1144.

Dreger, D. S., and D. V. Helmberger (1990). Broadband Modeling of Local Earthquakes, Bull. Seism. Soc. Am., 80 1162-1179.