Abstract
The Role of the Ocean Observatories Initiative in Monitoring the Offshore Earthquake Activity of the Cascadia Subduction Zone
Highlights
The paucity of recent earthquakes genic zone lies almost entirely offshore.The largest and some of the most damag can mean that the two plates are slip Global plate models (e.g., DeMets et al, ing earthquakes in history have occurred ping past each other without generating 2010) predict that ~8 m of slip perpendicuin subduction zones, where one plate earthquakes or that they are firmly locked lar to the margin has accumulated off cenplunges beneath another plate
To examine the impact of including Observatories Initiative (OOI) stations in routine operations and the potential of augmenting the offshore array by instrumenting additional exist ing OOI nodes with seismometers, we compare OOI and ocean bottom seis mometer (OBS) noise levels and look at three “case studies” of earthquakes occurring since 2014
The three shortperiod sensors at Southern Hydrate Ridge (SHR) are contained in narrow titanium cylinders that were buried by inserting them into a groove gouged by the arm of a remotely operated vehicle (Supplementary Figure S2); the groove was filled with glass beads
Summary
The largest and some of the most damag can mean that the two plates are slip Global plate models (e.g., DeMets et al, ing earthquakes in history have occurred ping past each other without generating 2010) predict that ~8 m of slip perpendicuin subduction zones, where one plate earthquakes or that they are firmly locked lar to the margin has accumulated off cenplunges beneath another plate. At the together, storing elastic strain that will tral Oregon since 1700 This slip deficit is Cascadia subduction zone (Figure 1), be released in a future large earthquake, large enough to generate a magnitude 8 or which extends from northern California or some combination thereof. Thermal larger earthquake if it is released through to Vancouver Island, the Juan de Fuca models (e.g., Hyndman and Wang, 1993; sudden slip on the shallow (offshore) plate.
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