Tomography of the Source Area of the 1995 Kobe Earthquake: Evidence for Fluids at the Hypocenter?
@article{Zhao1996TomographyOT,
title={Tomography of the Source Area of the 1995 Kobe Earthquake: Evidence for Fluids at the Hypocenter?},
author={Dapeng Zhao and Hiroo Kanamori and Hiroaki Negishi and Douglas A. Wiens},
journal={Science},
year={1996},
volume={274},
pages={1891 - 1894}
}Seismic tomography revealed a low seismic velocity (−5%) and high Poisson's ratio (+6%) anomaly covering about 300 square kilometers at the hypocenter of the 17 January 1995, magnitude 7.2, Kobe earthquake in Japan. This anomaly may be due to an overpressurized, fluid-filled, fractured rock matrix that contributed to the initiation of the Kobe earthquake.
300 Citations
High resolution seismic velocity structure around the Yamasaki fault zone of southwest Japan as revealed from travel-time tomography
- GeologyEarth, Planets and Space
- 2013
The Yamasaki fault zone in southwestern Japan currently has a high potential for producing a large damaging earthquake. We carried out a seismic tomographic study to determine detailed crustal…
The 2001 Bhuj earthquake: Tomographic evidence for fluids at the hypocenter and its implications for rupture nucleation
- Geology
- 2002
[1] The January 26, 2001 Bhuj earthquake (Mw 7.6) is one of the most catastrophic Indian earthquakes. We have investigated the 3-D seismic velocity and Poisson's ratio structures of the Bhuj source…
Role of fluids in the initiation of the 2008 Iwate earthquake (M7.2) in northeast Japan
- Geology
- 2008
[1] Seismic velocity (Vp, Vs) and Poisson's ratio (σ) images show that the hypocenter of the 2008 Iwate-Miyagi earthquake (M7.2) is located in a distinctive zone with low-Vp, slightly low-Vs and…
Hypocenter distribution and heterogeneous seismic velocity structure in and around the focal area of the 2008 Iwate-Miyagi Nairiku Earthquake, NE Japan—Possible seismological evidence for a fluid driven compressional inversion earthquake
- GeologyEarth, Planets and Space
- 2012
We have done seismic tomography in and around the focal area of the 2008 Iwate-Miyagi Nairiku Earthquake (M 7.2) occurred on June 14, 2008 in NE Japan. We used data from temporary aftershock…
Fault zone properties affecting the rupture evolution of the 2009 (Mw 6.1) L'Aquila earthquake (central Italy): Insights from seismic tomography
- Geology
- 2011
[1] We have inverted P- and S-wave travel times from seismograms recorded by a dense local network to infer the velocity structure in the crustal volume where the April 6th 2009 main shock nucleated.…
Crustal heterogeneity around the Nagamachi-Rifu fault, northeastern Japan, as inferred from travel-time tomography
- Geology
- 2006
An M=5 earthquake occurred on September 15, 1998, in the Nagamachi-Rifu fault (NRF), northeastern Japan. In the aftermath of this event, many seismograph stations were constructed temporarily around…
Seismic imaging of the aftershock zone of the 2001 Mw 7.7 Bhuj earthquake, India
- Geology
- 2006
[1] Detailed seismic tomography reveals that the 2001 Mw 7.7 Bhuj earthquake was associated with a 10–14% increase in Vp and Vs and a 10% decrease in Vp/Vs in the 10 to 35 km depth range covering a…
References
SHOWING 1-10 OF 29 REFERENCES
The 1994 Northridge Earthquake: 3‐D crustal structure in the rupture zone and its relation to the aftershock locations and mechanisms
- Geology
- 1995
A detailed 3-D P-wave velocity structure of the crust in the epicentral area of the 17 January, 1994 Northridge earthquake is determined by using 104,709 arrival times from 1673 Northridge…
The 1992 Landers earthquake sequence: Earthquake occurrence and structural heterogeneities
- Geology
- 1993
The June 28, 1992, Mw 7.3 Landers earthquake occurred in the southeastern Mojave Desert, California. Over 10,000 aftershocks of the earthquake were recorded by the Caltech-USGS Southern California…
Fluids below the hypocentral region of Latur Earthquake, India: Geophysical indicators
- Geology
- 1996
A set of geophysical measurements and observations was undertaken to investigate the nature of the crust beneath the epicentral region of the deadly Mw 6.1 Latur earthquake of September 30, 1993.…
Tomographic P‐wave velocity images of the Loma Prieta Earthquake asperity
- Geology
- 1990
Tomographic inversion is applied to delay times from local earthquakes to image 3-D velocity variations surrounding the main rupture of the 1989 Loma Prieta earthquake. The 55{times}45 square km…
Parkfield seismicity: Fluid-driven?
- Geology
- 1995
Characteristics of microearthquake occurrence along the locked-to-creeping transition of the San Andreas fault at Parkfield in central California are reviewed for evidence that fault zone fluids play…
Three-dimensional seismic structure beneath southwest Japan: The subducting Philippine Sea Plate
- Geology
- 1981
P to S converted wave observations at Long Valley Caldera
- Geology
- 1988
We report observations of P to S converted teleseismic body waves recorded with seismic stations located on the resurgent dome of Long Valley caldera. We observe strong conversions occurring at…
Deep structure of Japan subduction zone as derived from local, regional, and teleseismic events
- Geology
- 1994
We have determined a detailed three-dimensional P wave velocity structure of the Japan subduction zone to 500-km depth by inverting local, regional, and teleseismic data simultaneously. We used…
Three‐dimensional Vp /Vs variations for the Coso Region, California
- Geology
- 1988
Recent seismological studies of the Coso region of southeastern California document both low P wave velocities and abnormal SV attenuation in Indian Wells Valley, south of the Pleistocene volcanics…
Hydrogeology of thrust faults and crystalline thrust sheets: Results of combined field and modeling studies
- Geology
- 1991
Field, laboratory, and modeling studies of faulted rock yield insight into the hydraulic character of thrust faults. Late-stage faults comprise foliated and subparallel faults, with clay-rich gouge…