2021 Alaska Seismicity Summary

Thumbnail
Name:
2021_Seismicity_Summary.pdf
Size:
11.63Mb
Format:
PDF
Download
Author
Ruppert, Natalia
Gardine, Lea
Keyword
earthquake
Metadata
Show full item record
URI
http://hdl.handle.net/11122/12683
Abstract
The Alaska Earthquake Center reported 49,120 seismic events in Alaska and neighboring regions in 2021. The largest earthquake was a magnitude 8.2 event that occurred on July 29 southwest of Kodiak Island. It was followed by about 1,300 aftershocks including two magnitude 6.9 events on August 14 and October 11. Other active spots include sequences near Harding Lake in Interior Alaska in July-September and near Yakutat Bay in September. The largest earthquake in mainland Alaska was the M6.1 Chickaloon Earthquake on May 31. We continued to monitor ongoing activity within the 2018 M7.1 Anchorage, 2018 M6.4 Kaktovik, and 2018 M7.9 Offshore Kodiak aftershock sequences, the Purcell Mountains earthquake swarm, and the Wright Glacier cluster northeast of Juneau.
Table of Contents
1. Abstract 2. Introduction 3. Notable earthquakes and sequences of 2021 3.1. January 3 and September 24 M6.1 earthquakes in Andreanof Islands 3.2. May 31 M6.1 Chickaloon Earthquake 3.3. July 29 M8.2 Chignik Earthquake 3.4. July 23 M4.7 and September 14 M4.9 Harding Lake earthquakes 3.5. September 5-6 M4.0 and M4.1 Yakutat earthquakes 4. Ongoing aftershock sequences and swarms 4.1. 2020 M7.8 Simeonof aftershock sequence 4.2. 2018 M7.1 Anchorage aftershock sequence 4.3. 2018 M6.4 Kaktovik aftershock sequence 4.4. 2018 M7.9 Offshore Kodiak aftershock sequence 4.5. Purcell Mountains earthquake swarm 4.6. Northeast Brooks Range earthquake swarm 5. Glacial seismicity and Wright Glacier cluster 6. Acknowledgments 7. References
Date
2022-02-23
Type
Report
Collections