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Data Event Response to the January 23, 2020 M 6.2 Earthquake 22 km E of Tanaga Volcano, Alaska

Written by Kathleen Hodgkinson, Dave Mencin, & Beth Bartel
23 January 2020

Event Summary

A magnitude 6.2 earthquake occurred at 05:53:03 UTC on January 23, 2020, 22 km E of Tanaga Volcano, Alaska. For more information, see the USGS Earthquake Hazards Program event page.

The event occured within the Network of the Americas (NOTA) footprint. NOTA is a core component of the NSF Geodetic Facility for the Advancement of Geoscience (GAGE), operated by UNAVCO.

GAGE Response

NOTA GPS/GNSS Real Time Data Solutions
No NOTA stations with real-time capabilities were within the range to record a signal associated with this event.

NOTA GPS/GNSS High Rate Data for Post Processing
By PI request, UNAVCO is downloading high-rate 1-sps (1 Hz) data from 3 GPS/GNSS stations operated by UNAVCO for a 1-day time window centered on the event. Stations include AC66, AB21 and AB01. A map of downloaded stations is shown in Figure 1. When downloaded, these data will be available in RINEX format from the UNAVCO high rate data ftp site.

GAGE GPS/GNSS Displacement Estimates
Coseismic offsets are only estimated for stations for which we anticipate offsets >5 mm. We do not anticipated offsets >5mm for any stations for this event.

NOTA Borehole Strainmeter Data
This event was too small and distal from any NOTA borehole strainmeters to be recorded.

NOTA Borehole Tiltmeter Data
UNAVCO operates a network of tiltmeters as part of the GAGE NOTA network. All are installed around volcanic systems; 12 are installed in the Aluetians (on the UNAVCO network monitoring map, filter for "tilt"). Tilt data are available in time-stamped ASCII format from the UNAVCO Borehole Tilt data page. Although the nearest tiltmeter was ~850 km from the epicenter, the event was well recorded by the instruments around Akutan.

Note: Figures and findings are preliminary and subject to revision.

GAGE Data and Support

  • Please contact archive-gpsunavco.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 rtgpsunavco.org.
  • For information on past event responses, see the UNAVCO Geophysical Event Response page.


These data are provided by the 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. The Network of the Americas (NOTA) is a core component of the NSF GAGE Facility. To acknowledge use of these data please follow the acknowledgment guidelines.

High-resolution Figures

Related Links

Map Center:
Tanaga Volcano, Alaska


Last modified: 2020-01-28  22:49:48  America/Denver