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MEETINGS 2013-2015

388th meeting :   "How Often does the Mae Chan Fault Generate Large Earthquakes?"

Tuesday 10 Mar 2015.

A talk by Ray Weldon

The Talk:
This talk will be a progress report on work underway to determine the timing of recent ground-rupturing earthquakes on the Mae Chan Fault that runs through Chiang Rai province in NW Thailand. Preliminary work, done as part of a training course in 1994 in collaboration with the US Geological Survey (USGS), the Thai Department of Mineral Resources (DMR), and several universities (including Chulalongkorn and Chiang Mai). Subsequent work carried out by the DMR supported the hypothesis that the Mae Chan Fault caused the Wiang Yonok Nakon earthquake in the 5th century AD (e.g. Wood, 2012). Evidence includes faulting of layers containing cultural artifacts such as stone axes and pottery. Field work planned for February and March should verify this preliminary data and hopefully will provide the timing of earlier earthquakes with which to estimate how often the Mae Chan generates earthquakes large enough to rupture the ground surface. The presentation will review the past work and show those who attend what an active fault looksl ike in northern Thailand. 

The Speaker:       
Ray Weldon is Professor of Structural Geology and Neotectonics at the University of Oregon. He studies active faults in the field and works closely with seismologists, geodesists, geochronologists, and hazard and risk analysts to integrate field observations into
models of how faults work and generate seismic hazard and risk. Ray, his students and colleagues have recently worked on the Cascadia Subduction Zone and the Basin and Range in Oregon, the San Andreas Fault in California, and fold and thrust belts in Alaska and the Kyrgyz Tien Shan and on the Red River, Xianshuihe, and Mae Chan faults in SE Asia. In pursuit of his conviction to make science practical, Ray serves on the Executive Committee of the Uniform California Earthquake Rupture Forecast (UCERF, the official source model for California earthquakes), the Steering Committee for the US National Seismic Hazard Map (that sets national building codes, among other things), and consults for a number of public and private entities on seismic hazards posed to nuclear power plants and dams. Ray teaches the Oregon Geology and Summer Field Camp (in addition to specialized courses) and is most proud of having successfully graduated 22 MS and PhD students in his 27 years at Oregon..

Want to read more? ....click "HERE" (PDF File for downloading or reading on line - 10 pages).

For the presentation ... click  "HERE"  ( PDF File for downloading or reading on line - 51 slides).



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