Publications
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Review: Progress in rotational ground-motion observations from explosions and local earthquakes in Taiwan
Rotational motions generated by large earthquakes in the far field have been successfully measured, and observations agree well with the classical elasticity theory. However, recent rotational measurements in the near field of earthquakes in Japan and in Taiwan indicate that rotational ground motions are 10 to 100 times larger than expected from the classical elasticity theory. The near-field stro
Authors
William H. K. Lee, Bor-Shouh Huang, Charles A. Langston, Chin-Jen Lin, Chun-Chi Liu, Tzay-Chyn Shin, Ta-Liang Teng, Chien-Fu Wu
How the continents deform: The evidence from tectonic geodesy
Space geodesy now provides quantitative maps of the surface velocity field within tectonically active regions, supplying constraints on the spatial distribution of deformation, the forces that drive it, and the brittle and ductile properties of continental lithosphere. Deformation is usefully described as relative motions among elastic blocks and is block-like because major faults are weaker than
Authors
Wayne R. Thatcher
Deep low-frequency earthquakes in tremor localize to the plate interface in multiple subduction zones
Deep tremor under Shikoku, Japan, consists primarily, and perhaps entirely, of swarms of low-frequency earthquakes (LFEs) that occur as shear slip on the plate interface. Although tremor is observed at other plate boundaries, the lack of cataloged low-frequency earthquakes has precluded a similar conclusion about tremor in those locales. We use a network autocorrelation approach to detect and loca
Authors
Justin R. Brown, Gregory C. Beroza, Satoshi Ide, David R. Shelly, Kazuaki Ohta, Susan Y. Schwartz, Wolfgang Rabbel, M. Thorwart, Honn Kao
Accretionary orogens through Earth history
Accretionary orogens form at intraoceanic and continental margin convergent plate boundaries. They include the supra-subduction zone forearc, magmatic arc and back-arc components. Accretionary orogens can be grouped into retreating and advancing types, based on their kinematic framework and resulting geological character. Retreating orogens (e.g. modern western Pacific) are undergoing long-term ex
Authors
Peter A. Cawood, A. Kroner, W.J. Collins, T.M. Kusky, Walter D. Mooney, B.F. Windley
Shallow seismic structure of Kunlun fault zone in northern Tibetan Plateau, China: Implications for the 2001 M s8.1 Kunlun earthquake
The shallow seismic velocity structure of the Kunlun fault zone (KLFZ) was jointly deduced from seismic refraction profiling and the records of trapped waves that were excited by five explosions. The data were collected after the 2001 Kunlun Ms8.1 earthquake in the northern Tibetan Plateau. Seismic phases for the in-line record sections (26 records up to a distance of 15 km) along the fault zone w
Authors
Chun-Yong Wang, Walter D. Mooney, Z. Ding, J. Yang, Z. Yao, H. Lou
Probabilistic liquefaction hazard mapping
Many investigators have applied the liquefaction potential index (LPI) to map regional liquefaction hazard. LPI, which integrates the liquefaction potential of susceptible soil elements at a specific location into a single value, has been used to assess both (1) spatial variability of liquefaction potential, and (2) liquefaction potential of surficial geologic units. A promising application to map
Authors
Thomas L. Holzer
Report on the Aseismic Slip, Tremor, and Earthquakes Workshop
This report summarizes the discussions and information presented during the workshop on Aseismic Slip, Tremor, and Earthquakes. Workshop goals included improving coordination among those involved in conducting research related to these phenomena, assessing the implications for earthquake hazard assessment, and identifying ways to capitalize on the education and outreach opportunities presented by
Authors
Joan Gomberg, Evelyn Roeloffs, Anne Trehu, Herb Dragert, Charles Meertens
Strong tremor near Parkfield, CA, excited by the 2002 Denali Fault earthquake
We show clear evidence of non-volcanic tremor triggered by 2002 Mw7.8 Denali Fault earthquake near Parkfield. Triggered tremor is identified as bursts of high-frequency (∼2–8 Hz), non-impulsive seismic energy whose envelope is coherent among many stations and has the same periodicity as the passing surface waves. The tremor originates from at least three hypocenters near the San Andreas fault with
Authors
Zhigang Peng, John E. Vidale, Kenneth C. Creager, Justin L. Rubenstein, Joan S. Gomberg, Paul Bodin
High-resolution seismic images and seismic velocities of the San Andreas fault zone at Burro Flats, Southern California
To better understand the structure of the San Andreas fault (SAF) at Burro Flats in southern California, we acquired a three-dimensional combined set of seismic reflection and refraction profiles centered on the main active trace at Burro Flats. In this article, we discuss the variation in shallow-depth velocities along each seismic profile, with special emphasis on the 1500 m/sec P-wave velocity
Authors
C. C. Tsai, Rufus D. Catchings, Mark R. Goldman, Michael J. Rymer, P. Schnurle, H. W. Chen
Earthquakes generated from bedding plane-parallel reverse faults above an active wedge thrust, Seattle fault zone
A key question in earthquake hazard analysis is whether individual faults within fault zones represent independent seismic sources. For the Seattle fault zone, an upper plate structure within the Cascadia convergent margin, evaluating seismic hazard requires understanding how north-side-up, bedding-plane reverse faults, which generate late Holocene fault scarps, interact with the north-vergent mas
Authors
Harvey Kelsey, Brian Sherrod, Alan R. Nelson, Thomas M. Brocher
7th U.S. / Japan Natural Resources (UJNR) Panel on Earthquake Research: Abstract volume and technical program
The U.S. / Japan Natural Resources (UJNR) Panel on Earthquake Research promotes advanced study toward a more fundamental understanding of the earthquake process and hazard estimation. The Panel promotes basic and applied research to improve our understanding of the causes and effects of earthquakes and to facilitate the transmission of research results to those who implement hazard reduction measu
Authors
Shane T. Detweiler, William L. Ellsworth
What can we learn from the Wells, NV earthquake sequence about seismic hazard in the intermountain west?
The February 21, 2008 Wells, NV earthquake (M 6) was felt throughout eastern Nevada, southern Idaho, and western Utah. The town of Wells sustained significant damage to unreinforced masonry buildings. The earthquake occurred in a region of low seismic hazard with little seismicity, low geodetic strain rates, and few mapped faults. The peak horizontal ground acceleration predicted by the USGS Natio
Authors
M.D. Petersen, K.L. Pankow, G. P. Biasi, M. Meremonte