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Intermediate‐magnitude postseismic slip follows intermediate‐magnitude (M 4 to 5) earthquakes in California

Alwahedi, MA; Hawthorne, JC; (2019) Intermediate‐magnitude postseismic slip follows intermediate‐magnitude (M 4 to 5) earthquakes in California. [Letter]. Geophysical Research Letters , 46 (7) pp. 3676-3687. 10.1029/2018GL081001. Green open access

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Abstract

The magnitude of postseismic slip is useful for constraining physical models of fault slip. Here we examine the postseismic slip following intermediate‐magnitude (M 4 to 5) earthquakes by systematically analyzing data from borehole strainmeters in central and northern California. We assess the noise in the data and identify11 earthquakes that generated interpretable strain records. We estimate the earthquakes' postseismic to coseismic moment ratios by comparing the coseismic strain changes with strain changes induced by afterslip in the following 1.5 days. The median estimated postseismic moment is 0.45 times the coseismic moment, with a 90% confidence interval between 0.25 and 0.60. This postseismic moment is slightly larger than typically observed following large (M>6) earthquakes but smaller than observed following small (M2 to 4) earthquakes. The intermediate‐magnitude postseismic slip suggests a size dependence in the dynamics of earthquakes or in the properties of fault areas that surround earthquakes.

Type: Article
Title: Intermediate‐magnitude postseismic slip follows intermediate‐magnitude (M 4 to 5) earthquakes in California
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2018GL081001
Publisher version: https://doi.org/10.1029/2018GL081001
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
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 > Inst for Risk and Disaster Reduction
URI: https://discovery.ucl.ac.uk/id/eprint/10070897
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