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.
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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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