CaltechAUTHORS
  A Caltech Library Service

Rupture Process of the Kobe, Japan, Earthquake of Jan. 17, 1995, Determined from Teleseismic Body Waves

Kikuchi, Masayuki and Kanamori, Hiroo (1996) Rupture Process of the Kobe, Japan, Earthquake of Jan. 17, 1995, Determined from Teleseismic Body Waves. Journal of Physics of the Earth, 44 (5). pp. 429-436. ISSN 0022-3743. http://resolver.caltech.edu/CaltechAUTHORS:20150306-145847721

[img] PDF - Published Version
See Usage Policy.

370Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150306-145847721

Abstract

The source process of the 1995 Kobe earthquake is determined using teleseismic body waves. The source parameters obtained for the total source are: focal mechanism [strike, dip, rake] equal to [233°, 86°, 167°], nearly pure strike-slip with an EW compression axis; the seismic moment, M_o= 2.5×10^(19) Nm (M_w= 6.9); and source duration T=11s. The rupture process consists mainly of three subevents with source durations of 5-6 s: two are nearly pure strike-slip with slightly different fault strikes, and the other is dip-slip. Combining the source location with the aftershock distribution, we infer that the first subevent is a bilateral rupture and the later subevents are unilateral propagating NE and reaching the Kobe area. The total fault length is 40 km, the averaged dislocation is 2.1 m, and the averaged stress drop is 8 MPa. These source parameters indicate that the Kobe earthquake was a typical shallow inland earthquake which occurred on a previously mapped Quaternary fault zone. The directivity toward Kobe determined from teleseismic data was probably one of the main factors responsible for the heavy damage. The combined use of regional networks and teleseismic networks as demonstrated in this study will continue to be important for rapidly assessing the overall social impact of an earthquake in the very early stage of sequence.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://www.jstage.jst.go.jp/article/jpe1952/44/5/44_5_429/_articlePublisherArticle
Additional Information:© 1996 The Seismological Society of Japan. Received July 27, 1995; Accepted November 24, 1995. This research was partially supported by the Grant-in-Aid for Scientific Research No.04452067 from the Ministry of Education, Science, Sports and Culture of Japan, and by the National Science Foundation Grant EAR-9303804, U.S.A. Contribution No. 5579, Division of Geological and Planetary Sciences. California Institute of Technology, Pasadena, California 91125.
Funders:
Funding AgencyGrant Number
Ministry of Education, Science, Sports, and Culture (MEXT)04452067
NSFEAR-9303804
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences5579
Record Number:CaltechAUTHORS:20150306-145847721
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150306-145847721
Official Citation:Kikuchi, M., & Kanamori, H. (1996). Rupture Process of the Kobe, Japan, Earthquake of Jan. 17, 1995, Determined from Teleseismic Body Waves. Journal of Physics of the Earth, 44(5), 429-436. doi: 10.4294/jpe1952.44.429
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55618
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:06 Mar 2015 23:38
Last Modified:06 Mar 2015 23:38

Repository Staff Only: item control page