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Event
AEG OR Chapter November 21, 2017 Meeting
Paleo-earthquakes: How big? How often?
Examples from Interplate and Intraplate settings
PURCHASE OF TICKETS USING BROWN PAPER BAG: Ticket sales stops by 5pm on Friday November 17th.
(At the door payments in Cash or Checks only.)
6:00 Social Hour
6:45 Dinner (Salad and Pizza)
7:30 Presentation
PRESENTATION:
Speakers: Dr. Ashley Streig (Portland State University)
ABSTRACT:
Recent paleoseismic investigations on the Santa Cruz Mountains section (SAS) of the San Andreas Fault (SAF) reveal three post European surface rupturing earthquakes and one earlier earthquake that overlaps in time with paleoseismic records on the North Coast section of the SAF. Our results suggest at least two modes of behavior in strain release on the SAS, multi-segment earthquakes like 1906 (i.e. large, M 7 earthquakes), and sub-segment earthquakes in the Hazel Dell vicinity in the period prior to 1906. New work on the Meers fault in Oklahoma suggests at least two surface rupturing earthquakes in the last 2,000 years. New high resolution topography from lidar data, and new paleoseismic studies reveal that the Holocene trace extends at least 6 km northwest of the previously mapped trace. These new investigation results have interesting implications for more than one mode of strain release and surface fault rupture in this intraplate setting.
SPEAKER BIO: Dr. Ashley Streig
Dr. Streig has seventeen years experience in active tectonics, paleoseismology, structural geology and tectonic geomorphology. Her varied research experiences range from investigations of strike-slip, reverse and normal fault studies, to studies of fault mechanics, and regional tectonics. She attended Occidental College for her undergraduate degree, and Central Washington University for her Masters degree. She worked for a consulting firm, William Lettis & Associates., Inc. before returning to school to obtain her PhD with Dr. Ray Weldon at University of Oregon. Ashleys research and geologic consulting experience include; the study of active faults and folds, earthquakes and associated hazards, earthquake recurrence, fault behavior and rupture characteristics, estimating paleo-earthquake magnitude by relating observed deformation and earthquake timing between paleoseismic sites along a fault, fault reactivation, earthquake triggering. Dr. Streig has worked both nationally and internationally on seismic source characterizations and paleoseismic investigations on numerous Quaternary active faults. She has conducted field reconnaissance and mapping after surface rupturing earthquakes following the 2011 Mw 6.6 Iwaki earthquake, Japan, 2010 Mw 7.2 El Mayor-Cucapah earthquake, Mexico, and the 1999 Mw 7.6 Chi Chi, Taiwan earthquake. Dr. Streig has extensive experience with C14 and dendrochronologic dating techniques, and Bayesian statistical analysis using OxCal calibration software for earthquake age determination models.
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LocationOld Market Pub (View)
6959 SW Multnomah Blvd.
Portland, OR 97223
United States
Categories
| Kid Friendly: Yes! |
| Dog Friendly: No |
| Non-Smoking: Yes! |
| Wheelchair Accessible: Yes! |
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Contact
| Owner: Oregon AEG |
| On BPT Since: Nov 06, 2016 |
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| Chris Humphrey |
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