Distributed or Off-Fault Displacements of Reverse Faults

Session: Crustal Stress and Strain and Implications for Fault Interaction and Slip [Poster]
Type: Poster
Date: 4/28/2020
Time: 08:00 AM
Room: Ballroom
Description: 

In addition to primary surface fault displacements, off-strike or distributed displacements can be an engineering hazard for civil infrastructure. This research evaluates the reverse fault displacement data of 11 earthquakes (5.4 < M < 7.9) from around the world. The relationship between the width of rupture zone (WRZ) and other parameters is evaluated. It was found that a power function provides the best fit for both hanging wall and foot wall displacements perpendicular to primary fault strike. Although primary displacements tend to be largest towards the center of the fault, that trend is not observed for off-strike displacements. Also no relationship was found between the width of the rupture zone and the on-fault vertical displacements. However, the relationship between on-strike and off-strike vertical displacements was quantified. The statistics and probability distributions corresponding to these analyses are presented for use in engineering projects that must accomodate reverse faults displacements.

Presenting Author: Robb Moss

Authors