Triggering an unexpected earthquake in an uncoupled subduction zone.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33762346.
- Also identified by DOI 10.1126/sciadv.abf7590 and PMC identifier 7990338.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
In the 1970s, the Shumagin Islands region of the Alaska subduction zone was identified as a seismic gap expected to host a future great [moment magnitude (<i>M</i> <sub>w</sub>) ≥8.0] earthquake. More recent geodetic data indicate that this region is weakly coupled, and the geologic record shows little evidence of past large events. From July to October 2020, a series of earthquakes occurred in this region, raising the possibility of greater coupling. The initial <i>M</i> <sub>w</sub> 7.8 thrust faulting earthquake straddled the eastern edge of the Shumagin Gap and was followed by an <i>M</i> <sub>w</sub> 7.6 strike-slip earthquake within the Shumagin Gap. Stress modeling indicates that this strike-slip earthquake is in fact favored if the Shumagin Gap has low coupling, whereas a highly coupled Shumagin Gap inhibits that type and location of earthquake. The initial thrust earthquake and its afterslip enhanced the strike-slip loading within the subducting slab, helping to trigger the October event.