HR: 1320h
AN: S43A-0982    [Abstracts]
TI: Comparative Study of Local Magnitude Scales for Central U.S. and Western India
AU: * Miao, Q
EM: qingmiao@memphis.edu
AF: Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, TN 38152 United States
AU: Langston, C A
EM: clangstn@memphis.edu
AF: Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, TN 38152 United States
AB: Seismic waveform data from 816 aftershocks of 2001 Bhuj Mw 7.7 earthquake, recorded by CERI/STAR aftershock deployment, including eight K2 6-channel dataloggers with 3-component episensor accelerometers and 3-component L-28 geophones, were used to develop a local magnitude scale for Kachchh basin of western India. Results show that the distance correction curve can be expressed as -logA0=1.8286*(r/100.0)-0.0052*(r-100.0)+3.0, displaying weak distance attenuation. This result is much like that of the local magnitude scale for the Central U.S. Both scales show weak distance attenuation, compared with the local magnitude scales for southern California or Tanzania, East Africa, and display a negative K parameter, implying similar patterns of seismic wave spreading in these two regions. These results for local magnitude scales give support to the assertion that the Kachchh basin and New Madrid Seismic Zone are geological analogs inasmuch that ground motion and other seismological results from one area can shed light on similar problems in the other area.
DE: 7230 Seismicity and seismotectonics
DE: 7212 Earthquake ground motions and engineering
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2004 AGU Fall Meeting