February 27, 2021 M 5.3 Point MacKenzie, 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 18:59:25 UTC on Saturday, February 27, an earthquake occurred with an epicenter just across the Knik Arm of Cook Inlet from Anchorage, Alaska, where light to moderate shaking was felt. A tsunami warning was not issued for this event.

For more information on this magnitude 5.3 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-1724794. NOTA is a core component of the NSF GAGE Facility. To acknowledge use of these data please follow the acknowledgment guidelines.


  • > February 27, 2021 M 5.3 Point MacKenzie, Alaska Earthquake

Written by:

  • Scott K. Johnson
  • Posted: 10 March 2021
  • Last updated: 26 March 2021

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

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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 is downloading 1- and 5-sps (1 and 5 Hz) data from all NOTA GPS/GNSS stations within 110 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.

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