New constraints on the uplift of October 9, 1995 Jalisco-Colima earthquake (Mw 8) based on the analysis of tsunami records at Manzanillo and Navidad, Mexico

Abstract

Tsunami records registered during the October 9, 1995 Jalisco-Colima earthquake (Mw 8) by two tide gauges and one pressure gauge are analyzed to estimate the coseismic subsidence at Manzanillo and Navidad Bay. Numerical modeling of the tsunami waveform determined the location and magnitude of the maximum coseismic uplift on the fault plane. To fit the observed data, the fault slip offshore from Manzanillo is required to be 2-3 times smaller than the average slip on the fault plane off Navidad Bay. The new constraints on the coseismic uplift distribution obtained combined with the existing coseismic inland GPS data should accomplish a new more detailed inversion of the fault-slip distribution.