UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Data‐driven two‐fault modelling of the Mw 6.0 2008 Wells, Nevada earthquake suggests a listric fault rupture

Frietsch, M; Ferreira, AMG; Funning, GJ; (2021) Data‐driven two‐fault modelling of the Mw 6.0 2008 Wells, Nevada earthquake suggests a listric fault rupture. Journal of Geophysical Research: Solid Earth 10.1029/2020jb020263. (In press).

[img] Text
Frietsch_et_al_2019_revision_3rd_bw.pdf - Accepted version
Access restricted to UCL open access staff until 9 September 2021.

Download (39MB)

Abstract

Structural fault complexity at depth affects seismic hazard, earthquake physics and regional tectonic behavior, but constraining such complexity is challenging. We present earthquake source models of the 21 February 2008, Mw 6.0 Wells event that occurred in the Basin and Range in the western USA suggesting the rupture of both the shallow and deep parts of a listric fault. We use a large data set including 150 local seismic waveforms from the USArray combined with high‐quality InSAR and teleseismic waveforms. Rather than imposing an a priori fault geometry in the source inversions, as is often done in the literature, we use a data‐driven approach whereby all the faulting parameters and number of faults are determined by the data alone. We find a two‐fault normal faulting solution comprising: (i) a shallow (centroid depth ∼4.6 km) sub‐event with Mw 5.3 and fault dip of ∼ 77°; and (ii) a deeper (centroid depth ∼ 8.8 km), larger Mw 6.0 sub‐event on a fault with shallower dip angle ( ∼ 41°). Our preferred two‐fault model is consistent with aftershocks and with the tectonics of the region. The local USArray waveforms used in the modeling are key to detect the rupture of both shallow and deep parts of the possible listric fault. The lack of such dense and uniform coverage of earthquakes in other regions on Earth may explain why the full seismic rupture of listric faults may have gone undetected in the past. Thus, earthquake slip on whole listric faults may be more common than previously thought.

Type: Article
Title: Data‐driven two‐fault modelling of the Mw 6.0 2008 Wells, Nevada earthquake suggests a listric fault rupture
DOI: 10.1029/2020jb020263
Publisher version: http://doi.org/10.1029/2020jb020263
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10122651
Downloads since deposit
1Download
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item