Fault Zone Guided Wave generation on the locked, late interseismic Alpine Fault, New Zealand
Fault Zone Guided Waves (FZGWs) have been observed for the first time within New Zealand's transpressional continental plate boundary, the Alpine Fault, which is late in its typical seismic cycle. Ongoing study of these phases provides the opportunity to monitor interseismic conditions in the f...
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Published in | Geophysical research letters Vol. 42; no. 14; pp. 5736 - 5743 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington
Blackwell Publishing Ltd
28.07.2015
John Wiley & Sons, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Fault Zone Guided Waves (FZGWs) have been observed for the first time within New Zealand's transpressional continental plate boundary, the Alpine Fault, which is late in its typical seismic cycle. Ongoing study of these phases provides the opportunity to monitor interseismic conditions in the fault zone. Distinctive dispersive seismic codas (~7–35 Hz) have been recorded on shallow borehole seismometers installed within 20 m of the principal slip zone. Near the central Alpine Fault, known for low background seismicity, FZGW‐generating microseismic events are located beyond the catchment‐scale partitioning of the fault indicating lateral connectivity of the low‐velocity zone immediately below the near‐surface segmentation. Initial modeling of the low‐velocity zone indicates a waveguide width of 60–200 m with a 10–40% reduction in S wave velocity, similar to that inferred for the fault core of other mature plate boundary faults such as the San Andreas and North Anatolian Faults.
Key Points
Fault Zone Guided Waves observed within the late interseismic Alpine Fault
Transpressional Alpine Fault zone comparable at depth to San Andreas Fault |
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Bibliography: | ArticleID:GRL53175 National Environment Research Council - No. NE/H012486/1 istex:B7C5E0447F5299AD8BDB8657A2ADEB79C362CE67 Marsden - No. UOA1012 ark:/67375/WNG-8FV8S349-L Text S1, Figures S1-S3, and Table S1 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1002/2015GL064208 |