Near-Field Directionality of Earthquake Strong Ground Motions Measured by Displaced Rocks
Session: Advances in Understanding Near-Field Ground Motions: Observation, Prediction and Application I
Type: Oral
Date: 4/22/2021
Presentation Time: 10:00 AM Pacific
Description:
This study documents coseismic displacement of 1437 rocks in the near-field (< 5 km) of the 2016 MW 6.1 reverse surface-rupturing earthquake near the Petermann Ranges, Central Australia. The data show variable directions of displacement over an area of 100 km2 along and across the surface rupture and preserve variable hanging-wall and foot-wall effects. We interpret our field data to record combinations of co-seismic directional permanent ground displacements associated with elastic rebound (fling) and transient ground shaking, with intensities of motion increasing with proximity to the surface rupture. We compare field data with theoretical finite-fault modelling of static and dynamic strong ground motions for uni-lateral and bi-lateral rupture scenarios, with field observations best represented by bi-lateral rupture models. These field data provide a proxy test for available rupture models for directionality of near-field strong ground motions in the absence of near-field instrumental data for dip-slip earthquakes.
Presenting Author: Tamarah King
Student Presenter: No
Authors
Tamarah King Presenting Author Corresponding Author tamarah.king@earth.ox.ac.uk University of Oxford |
Mark Quigley mark.quigley@unimelb.edu.au University of Melbourne |
Januka Attanayake januka.attanayake@unimelb.edu.au University of Melbourne |
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Near-Field Directionality of Earthquake Strong Ground Motions Measured by Displaced Rocks
Category
Advances in Understanding Near-Field Ground Motions: Observation, Prediction and Application