Physics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e..48m&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 5, pp. 48-1, CiteID 1244, DOI 10.1029/2002GL015380
Physics
27
Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Ground Motions And Engineering, Seismology: Earthquake Parameters
Scientific paper
The ground motion data of the 1999 Chi-Chi, Taiwan, earthquake exhibit a striking difference in frequency content between the north and south portions of the rupture zone. In the north, the ground motion is dominated by large low-frequency displacements with relatively small high-frequency accelerations. The pattern is opposite in the south, with smaller displacements and larger accelerations. We analyze the fault dynamics in light of a fault lubrication mechanism using near-field seismograms and a detailed rupture model. The fault zone contains viscous material (e.g., gouge), in which pressure increases following the Reynolds lubrication equation. When the displacement exceeds a threshold, lubrication pressure becomes high enough to widen the gap, thereby reducing the area of asperity contact. With less asperity contact, the fault slips more smoothly, suppressing high-frequency radiation.
Brodsky Emily E.
Ji Chen
Kanamori Hiroo
Ma Kuo-Fong
Mori Jim J.
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