2021
DOI: 10.1029/2021jb022180
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Probing the Southern Cascadia Plate Interface With the Dense Amphibious Cascadia Initiative Seismic Array

Abstract: Fault coupling is a critical component of the overall seismic cycle because regions of enhanced strain accumulation have frequently been spatially correlated with high coseismic slip. Relative plate motion is accommodated in earthquakes, slow slip transients, and longer term creep. The interaction of these different modes of motion are still not well understood (Walton et al., 2021). The canonical model of the subduction zone includes a highly coupled megathrust, composed predominantly of large velocity weaken… Show more

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Cited by 6 publications
(5 citation statements)
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“…They inferred these clusters occurred mostly in the uppermost Gorda slab based on phases reflected from the slab Moho. Their seismicity cluster “C2” seems to correspond with the “Fortuna” cluster examined by Alongi et al ( 23 ), who noted increased seismic activity in concert with an apparent change in coupling on the subduction interface. Notably, the aftershock sequence of the 2022 M w 6.4 rupture exhibits high rates of seismicity within the same zone as this previously studied cluster, including a linear zone of strike-slip events concentrated at 17- to 18-km depth ( Fig.…”
Section: Discussionsupporting
confidence: 59%
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“…They inferred these clusters occurred mostly in the uppermost Gorda slab based on phases reflected from the slab Moho. Their seismicity cluster “C2” seems to correspond with the “Fortuna” cluster examined by Alongi et al ( 23 ), who noted increased seismic activity in concert with an apparent change in coupling on the subduction interface. Notably, the aftershock sequence of the 2022 M w 6.4 rupture exhibits high rates of seismicity within the same zone as this previously studied cluster, including a linear zone of strike-slip events concentrated at 17- to 18-km depth ( Fig.…”
Section: Discussionsupporting
confidence: 59%
“…White dashed line shows the Slab2 ( 13 ) model, while the solid white line shows the model of McCrory et al ( 10 ) for the subduction interface. Black boxes show the area where the Fortuna ( 23 ), and equivalent C2 ( 15 ) clusters were observed with long-term activity before the 2022 earthquake. White boxes in (A) and (B) show the extents of zoomed views in parts (C) and (D), respectively.…”
Section: Resultsmentioning
confidence: 99%
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“…The absence of shallow seismicity at the southern end of the margin was also interpreted as reflecting a highly coupled region by Alongi et al. (2021).…”
Section: Along‐strike Behaviormentioning
confidence: 86%
“…The southernmost asperity we interpret based on interplate seismicity here hugs a slow slip patch of Bartlow (2020), but the abundant seismicity implies loading on the downdip edge of strong locking; however, whether events at the southern end of the margin are truly interplate is ambiguous due to the complexity of the MTJ. The absence of shallow seismicity at the southern end of the margin was also interpreted as reflecting a highly coupled region by Alongi et al (2021).…”
Section: Asperitiesmentioning
confidence: 99%