Assumed to be the direct successor of the 1788 Kodiak Island Earthquake, the rupture continued westwards with a small magnitude than the earthquake from July 21st. Even though the evidence is more limited, statigraphic records (Engelhart et al., 2018) and historic reports (Sykes et al., 1981) hint towards a 300km long rupture, which can be associated to a Mw 8.3-8.4 earthquake.
|1788 Jul 21st||1788 Kodiak Island Earthquake||Alaska||8.6||C|
|1788 Aug 06th||1788 Shumagin Earthquake||Alaska||8.3||C|
|Preferred Magnitude||8.30 (8.00-8.40)|
|Quality of Evidence||C|
|2018||Engelhart et al. (2018)||8.3 (8.3-8.4)|
This table lists some of the most relevant publications in estimating the moment magnitude of this earthquake. If you think there are other important or new publications, please get in contact.