Examining Taiwanese Historical Earthquakes From Literature Intensity to Synthetics for the Understanding of Fault System, Multiple Fault Segments Rupture and Seismic Hazard Analysis

Date: 4/26/2019

Time: 11:30 AM

Room: Pike

Taiwan Earthquake Model (TEM) published the first public PSHA map of Taiwan in late 2015, which adopt the source parameters of 38 seismogenic structures under a single fault segment basis, and shallow areal source for crustal events, and, intraplate, and interplate subduction events. The occreence of moderate, but, damaging 20160206 M6.4 Meinong and 20180206 M6.5 Hualiean earthquake brought the attention on the notes of the seismic hazard potential addressed in TEM PSHA2015. Historically, significant crustal damaging earthquakes in Taiwan mostly were from complicated fault system rather than from a single fault segment, which was not yet incorporated in the seismic hazard analysis. The 1906 M7.1 Meishan earthquake, recently, had been resolved to be from a fault system of blind NE strike thrust with EW surface breaching fault (one of the identified seismogenic structures). And, the 1935 M7.1 was occurred with bilateral rupture from a blind fault to strike-slip mechanism to the south and thrusting mechanism to the north. We employed the rupture kinematic modeling to the historical geodetic data with comaprison to the intensity pattern to understand the possible involement of the fault system. These historical and past events suggest that a single fault segment evaluation for seismic hazard might be inadequate. But, we have not yet had solution to solve this inadequacy. We examined the effect of the hazard assessment from the fault rupture system from kinematic and dynamic modeling of the historical events. In addition to the damaging earthquakes from seismic active region, an ancient 1604 M7.5-M8.0 Quanchao damaging Earthquake in southeastern coast China region was also explored from literature intensity to understand the seismic potential of less seismic active regime. We hope the effort we had made in past several years in studying the historical earthquakes could shred a light on the importance of resolving historical damaging earthquakes from modern developed seismology to seismic hazard assessment and risk management.

Presenting Author: Kuo-Fong Ma

Authors