May 31, 2021 M 6.1 Chickaloon, Alaska Earthquake

Event response pages are a service to help coordinate community science after an earthquake or other notable geophysical event by collecting relevant data. Findings and figures are preliminary and subject to revision.

At 6:59:54 (UTC) on May 31, 2021 there was a magnitude 6.1 earthquake with an epicenter 73 kilometers north of Chickaloon, Alaska (and 161 kilometers northeast of Anchorage). UNAVCO staff have assessed nearby GPS/GNSS stations for data availability and archived 1 Hz and 5 Hz data where possible for access via our data portals.

For more information on this earthquake, see the USGS Earthquake Hazards Program event page or the Alaska Earthquake Center event page. The event occurred within the footprint of the Network of the Americas (NOTA), a network of continuous GPS/GNSS stations and borehole instruments operated by UNAVCO that monitors plate motion and transient deformation, in addition to other applications.

These data are provided by the Geodetic Facility for the Advancement of Geoscience (GAGE) Facility, operated by UNAVCO, Inc. with support from the National Science Foundation and the National Aeronautics and Space Administration under NSF Cooperative Agreement EAR-1724794NOTA is a core component of the NSF GAGE Facility. To acknowledge use of these data please follow the acknowledgment guidelines.

Did you feel it?

The USGS collects information from people who felt an earthquake and creates maps that show what people experienced and the extent of the damage

Submit a response

Written by:

  • Scott K. Johnson
  • Posted: 4 June 2021
  • Last updated: 4 June 2021

Did you feel it?

The USGS collects information from people who felt an earthquake and creates maps that show what people experienced and the extent of the damage

Submit a response

Response Data

Please contact archive-gps@unavco.org for information on data availability. To request access to these and other RT-GPS stations operated by UNAVCO please send an email request to rtgps@unavco.org.

NOTA GPS/GNSS High-Rate Data for Post Processing

UNAVCO has downloaded 1- and 5-sps (1 and 5 Hz) data from all NOTA GPS/GNSS stations within 150 km of the epicenter where it is available. The 1 Hz data are available in RINEX format from the data ftp site here, and 5 Hz data are available here. They can also be accessed via the Data Archive Interface.

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