[Withdrawn] Relationships Between the Width of Surface Rupture Zone and Related Parameters for Reverse Events

Date: 4/25/2019

Time: 06:00 PM

Room: Grand Ballroom

Forecasting surface fault rupture is necessary for many engineering projects. In addition to the probability of the mean and maximum displacement along strike, the distribution of off-fault displacement perpendicular to fault strike is also important, particularly for reverse events with their hanging and footwall characteristics. Reverse surface faulting data was evaluated from 11 earthquakes (5.4≤M≤7.9) around the world. The relationship between the width of rupture zone (WRZ) and other parameters was evaluated. The data was first smoothed for Bias Weighting using Brown’s simple exponential moving average (EMA) which helped to eliminate unusual large width of rupture zone. Many probability distributions were evaluated against the data and we found that a power function (axb+c) provided the best to the WRZ data. On-fault surface rupture displacement has been found to occur mostly near the center of the fault, and we expected to observe similar results for off-fault surface ruptures but we found no clear correlation between the magnitudes of the WRZ and the along strike fault distance ratio, X/L. Also, no distinct relationship was found between the WRZ and on-fault vertical displacement. However, a relationship between principle vertical off-fault displacements and distributed vertical off-fault displacements was observed.

Presenting Author: Kourosh Younesi

Authors