Aseismic Transform Fault Slip at the Mendocino Triple Junction From Characteristically Repeating Earthquakes
Abstract
We report that the Mendocino Triple Junction (MTJ), at the northern terminus of the San Andreas Fault system, is an actively deforming plate boundary region with poorly constrained estimates of seismic coupling on most offshore fault surfaces. Characteristically repeating earthquakes provide spatial and temporal descriptions of aseismic creep at the MTJ, including on the oceanic transform Mendocino Fault Zone (MFZ) as it subducts beneath North America. Using a dataset of earthquakes from 2008 to 2017, we find that the easternmost segment of the MFZ displays creep during this period at about 65% of the long-term slip rate. We also find creep at slower rates on the shallower strike-slip interface between the Pacific plate and the North American accretionary wedge, as well as on a fault that accommodates Gorda subplate internal deformation. Finally, after a nearby M5.7 earthquake in 2015, we observe a possible decrease in aseismic slip on the near-shore MFZ that lasts from 2015 to at least early 2017.
- Authors:
-
- Berkeley Seismology Lab, Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1479379
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 2; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Materna, Kathryn, Taira, Taka'aki, and Bürgmann, Roland. Aseismic Transform Fault Slip at the Mendocino Triple Junction From Characteristically Repeating Earthquakes. United States: N. p., 2018.
Web. doi:10.1002/2017GL075899.
Materna, Kathryn, Taira, Taka'aki, & Bürgmann, Roland. Aseismic Transform Fault Slip at the Mendocino Triple Junction From Characteristically Repeating Earthquakes. United States. https://doi.org/10.1002/2017GL075899
Materna, Kathryn, Taira, Taka'aki, and Bürgmann, Roland. Tue .
"Aseismic Transform Fault Slip at the Mendocino Triple Junction From Characteristically Repeating Earthquakes". United States. https://doi.org/10.1002/2017GL075899. https://www.osti.gov/servlets/purl/1479379.
@article{osti_1479379,
title = {Aseismic Transform Fault Slip at the Mendocino Triple Junction From Characteristically Repeating Earthquakes},
author = {Materna, Kathryn and Taira, Taka'aki and Bürgmann, Roland},
abstractNote = {We report that the Mendocino Triple Junction (MTJ), at the northern terminus of the San Andreas Fault system, is an actively deforming plate boundary region with poorly constrained estimates of seismic coupling on most offshore fault surfaces. Characteristically repeating earthquakes provide spatial and temporal descriptions of aseismic creep at the MTJ, including on the oceanic transform Mendocino Fault Zone (MFZ) as it subducts beneath North America. Using a dataset of earthquakes from 2008 to 2017, we find that the easternmost segment of the MFZ displays creep during this period at about 65% of the long-term slip rate. We also find creep at slower rates on the shallower strike-slip interface between the Pacific plate and the North American accretionary wedge, as well as on a fault that accommodates Gorda subplate internal deformation. Finally, after a nearby M5.7 earthquake in 2015, we observe a possible decrease in aseismic slip on the near-shore MFZ that lasts from 2015 to at least early 2017.},
doi = {10.1002/2017GL075899},
journal = {Geophysical Research Letters},
number = 2,
volume = 45,
place = {United States},
year = {Tue Jan 09 00:00:00 EST 2018},
month = {Tue Jan 09 00:00:00 EST 2018}
}
Web of Science
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