2012 Annual Meeting
San Diego, California
Field Trip Information
Both field trips will take place on Friday, 20 April 2012. (the day following the close of the regular meeting program). Departure and return times are approximate.
100% refund if cancellation is received before the online registration deadline. Field trip cancellations received after the deadline will received 100% refund IF another person fills the vacated place on the trip. Unfilled cancellations will be refunded only as funds allow.
Field Trip #1: UCSD Large High Performance Outdoor Shake Table (LHPOST)
Leaders: José Restrepo, Professor of Structural Engineering, UCSD
Dan Radulescu, NEES@UCSD manager
The NEES @ UCSD Large High Performance Outdoor Shake Table (LHPOST) is a national earthquake test facility funded by the National Science Foundation through the George E. Brown Jr. Network for Earthquake Engineering Simulation (NEES) program. This facility, located at the Englekirk Structural Engineering Center of the University of California at San Diego, provides the earthquake engineering community with an earthquake simulator that allows the accurate reproduction of severe near-source earthquake ground motions for testing of very large structural and soil-foundation-structure interaction (SFSI) systems. In this network, earthquake engineers and students, located at different institutions around the nation and the world, are able to perform experimental work and collaborate to develop better and more cost-effective ways of mitigating earthquake damage.
The objective of the field trip is to visit the facility and have a taste of the one-of-a-kind large-scale experiments usually made for the validation and calibration of analytical simulation tools, which cannot be readily achieved from testing at smaller scale, or under quasi-static or pseudo-dynamic test conditions. The facility also contains two soil pits for testing deep foundations and has a blast test simulator.
A 5-story building, fully outfitted all nonstructural elements, health rooms and a working elevator is currently on the shake table. This building is the product of multi-institutional research collaboration between government organizations, national and international industry and academia, and will be the largest test in earthquake engineering conducted in the United States.
Lunch will be provided at the end of the tour. This is a half-day trip, leaving from the Town and Country around 9 am and returning around 1 pm. Note: The Englekirk Canter has to meet all OSHA safety requirements. Please do NOT come with open shoes or high heels.
Field Trip #2: Paleoseismic Slip Rates on the Elsinore Fault, California
Leader: Tom Rockwell, San Diego State University, Department of Geological Sciences
Kim Le Blisniuk, Post-doc at BGC
The Elsinore fault is the western onshore branch of the San Andreas fault zone in southern California. The slip rate along the northern Elsinore fault is estimated at about 5 mm/yr, but the activity and rate of the southern Elsinore fault has come under some scrutiny lately, as InSAR implies a low slip rate towards its southern end. On this field trip, we will examine evidence for several aspects that are relevant to the significance of the Elsinore fault in the Coyote Mountains, western Salton Trough, near the very southern end of the fault. First, we will walk along an approximately 1 km section of the fault that ruptured in the past 300 years. Along this section, we will see offsets from the most recent event plus at least two other late Holocene events. In addition, we will look at alluvial fans that have been laterally offset by tens to hundreds of meters in the late Quaternary; these fans have been dated with u-series on pedogenic carbonate and cosmogenic radionuclides, yielding a slip rate at the southernmost end of the fault of about 1.8 mm/yr. We will then drive a few kms to the NW where the slip in past earthquakes is larger, and look at offset alluvial fans that have distinct blast assemblages that indicate their source canyons. Ongoing mapping and dating of these fans indicates that the slip rate increases to the NW towards the central part of the Coyote Mountains and may be as much as 3 mm/yr. We will discuss the tectonic implications of these findings.
This trip will leave around 8:00 am from the Town and Country and return at approximately 6:00 pm the same day. Trip includes an estimated 4 hours of drive time and 4 hours of moderate walking on uneven terrain. Participants should wear sturdy shoes. Lunch will be provided.
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