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Tide Gauges Capture Tremor Episodes in Cascadia
https://www.seismosoc.org/news/tide-gauges-capture-tremor-episodes-in-cascadian-subduction-zone/Tide Gauges Capture Tremor Episodes in Cascadia
Published on 15 February 2019 | BSSA, Journals, News
15 February 2019–Hourly water level records collected from tide gauges can be used to measure land uplift caused by episodic tremor and slip of slow earthquakes in the Cascadia Subduction Zone, according to a new report in the Bulletin of the Seismological Society of America.
Global Positioning System (GPS) data are typically used to measure uplift from these events, but the new findings offer a way to study the phenomena using tidal gauge records collected in the pre-GPS era, before 1995, the study’s authors said.
The Cascadia Subduction Zone marks where the North American continental plate collides with multiple oceanic plates. The collision can produce devastating megathrust earthquakes that result in massive loss of life and damage to infrastructure, with the last one occurring in the region in 1700. But the zone also hosts slow earthquakes, accompanied by episodic tremor and slip (ETS), that take months or years to release the energy built up by the colliding plates.
…
Both the GPS and tide gauge data suggest these events occurred every 14.6 months between 1996 and 2011, but Alba and colleagues could not find that same pattern in the tide gauge data from 1980 to 1995. “Our results are too preliminary to characterize how ETS changes, or if ETS was present during the pre-GPS era, but there does appear to have been a change,” they write.
…
Published on 15 February 2019 | BSSA, Journals, News
15 February 2019–Hourly water level records collected from tide gauges can be used to measure land uplift caused by episodic tremor and slip of slow earthquakes in the Cascadia Subduction Zone, according to a new report in the Bulletin of the Seismological Society of America.
Global Positioning System (GPS) data are typically used to measure uplift from these events, but the new findings offer a way to study the phenomena using tidal gauge records collected in the pre-GPS era, before 1995, the study’s authors said.
The Cascadia Subduction Zone marks where the North American continental plate collides with multiple oceanic plates. The collision can produce devastating megathrust earthquakes that result in massive loss of life and damage to infrastructure, with the last one occurring in the region in 1700. But the zone also hosts slow earthquakes, accompanied by episodic tremor and slip (ETS), that take months or years to release the energy built up by the colliding plates.
…
Both the GPS and tide gauge data suggest these events occurred every 14.6 months between 1996 and 2011, but Alba and colleagues could not find that same pattern in the tide gauge data from 1980 to 1995. “Our results are too preliminary to characterize how ETS changes, or if ETS was present during the pre-GPS era, but there does appear to have been a change,” they write.
…
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