Apparent stress and corner frequency variations in the 1999 Taiwan (Chi-Chi) sequence: Evidence for a step-wise increase at Mw ˜ 5.5

Details Apparent stress and corner frequency variations in the 1999 Taiwan (Chi-Chi) sequence: Evidence for a step-wise increase at Mw ˜ 5.5 Apparent stress and corner frequency variations in the 1999 Taiwan (Chi-Chi) sequence: Evidence for a step-wise increase at Mw ˜ 5.5

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3610308m&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 10, CiteID L10308

Physics

7

Seismology: Earthquake Source Observations (1240), Seismology: Earthquake Dynamics (1242), Seismology: Body Waves, Seismology: Earthquake Ground Motions And Engineering Seismology

Scientific paper

Apparent stress and corner frequencies are measured for the Chi-Chi, Taiwan sequence beginning with the M w 7.6 mainshock on 20 September 1999. Using the coda source ratio method, we obtained stable source ratio estimates using broadband stations on Taiwan. We find the following: (1) For the mainshock and 3 of the larger aftershocks, apparent stress is clustered around 0.8 MPa (±0.1 MPa); (2) Events below ˜M w 5.5 exhibit lower apparent stress with larger scatter, ranging between ˜0.08 and 0.8 MPa and are spatially variable; 3) The Brune [1970a, 1970b] omega-square source model fits the spectral shape for events 4.7 < M w < 7.6, however a step-wise break in self-similarity exists at ˜M w 5.5. We hypothesize that larger events are subject to the regional state-of-stress, whereas smaller aftershocks are sensitive to the local state-of-stress from stress-field redistribution following the mainshock and/or fault zone lubrication that affects only larger events.

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