Seismological constraints on the down-dip shape of normal faults

Reynolds, Kirsty and Copley, Alex (2017) Seismological constraints on the down-dip shape of normal faults. Geophysical Journal International, 213 (1). pp. 534-560. ISSN 0956-540X DOI

ggx432.pdf - Published Version
Available under License Creative Commons Attribution.

Download (12MB) | Preview
Official URL:


We present a seismological technique for determining the down-dip shape of seismogenic normal faults. Synthetic models of non-planar source geometries reveal the important signals in teleseismic P and SH waveforms that are diagnostic of down-dip curvature. In particular, along-strike SH waveforms are the most sensitive to variations in source geometry, and have significantly more complex and larger-amplitude waveforms for curved source geometries than planar ones. We present the results of our forward-modelling technique for 13 earthquakes. Most continental normal-faulting earthquakes that rupture through the full seismogenic layer are planar and have dips of 30°–60°. There is evidence for faults with a listric shape from some of the earthquakes occurring in two regions; Tibet and East Africa. These ruptures occurred on antithetic faults, or minor faults within the hanging walls of the rifts affected, which may suggest a reason for the down-dip curvature. For these earthquakes, the change in dip across the seismogenic part of the fault plane is ≤30°.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
12 - PhD
Journal or Publication Title: Geophysical Journal International
Volume: 213
Page Range: pp. 534-560
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 15 Mar 2018 23:36
Last Modified: 09 Jan 2019 13:35

Actions (login required)

View Item View Item

About cookies