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Data Event Response to the March 31, 2020 M 6.5 Earthquake 72 km W of Challis, Idaho

Written by Kathleen Hodgkinson, Dave Mencin, & Beth Bartel
Originally posted 31 March 2020
Last updated 13 April 2020

Event Summary

A magnitude 6.5 earthquake occurred at 23:52:31 UTC (17:52:31 local) on March 31, 2020, 72 km W of Challis, Idaho (referred by the Idaho Geological Survey as the Stanley earthquake). 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
11 GPS/GNSS stations within 300 km of the epicenter were operating in real-time during the event, i.e., they were continuously streaming high rate (1-sps / 1 Hz) data to UNAVCO (Figure 1). Typical latencies for real-time stations, the time lapse between and observation being recorded on the receiver and it arriving in Boulder are less than 1 second.

NOTA GPS/GNSS High-Rate Data for Post Processing
UNAVCO will be downloading high-rate 1- and 5-sps (1 and 5 Hz) data from select NOTA GPS/GNSS stations. 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 were not estimated for this event.

NOTA Borehole Strainmeter Data
A fully processed 1-sps borehole strainmeter (BSM) dataset for this event will be produced. This dataset can be downloaded from the UNAVCO borehole strainmeter event response page when it is available. See Figures 2 and 3 for examples of signals recorded by the BSM network.

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:
Challis, Idaho


Last modified: 2020-04-28  13:24:10  America/Denver