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Data Event Response to the January 28, 2020 M 7.7 Earthquake 125 km NNW of Lucea, Jamaica



Written by Dave Mencin, Kathleen Hodgkinson, & Andria Ellis
03 February 2020



Event Summary

A magnitude 7.7 earthquake occurred at 19:10:25 UTC on January 28, 2020, 125 km NNW of Lucea, Jamaica. 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 in the Caribbean
NOTA operates 54 GNSS stations within 1200 km of the January 28, 2020 M7.7 earthquake (Figure 1). These data are processed daily by the GAGE GNSS Analysis Center at Central Washington University and the position estimates used by the GAGE GNSS Analysis Center Coordinator (ACC), Professor Tom Herring of MIT, to calculate station velocities (Figure 2). Note: Figures and findings are preliminary and subject to revision.

NOTA GPS/GNSS Real Time Data Solutions
11 GPS/GNSS stations within 900 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 3). 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 downloaded high-rate 1-sps (1 Hz) data from 30 and 5-sps data from 29 stations operated by UNAVCO within ~1200 km of the epicenter for a 3-hour time window centered on the event (Figure 1). A map of downloaded stations is shown in Figure 1. When downloaded, these data are available in RINEX format from the UNAVCO high rate data ftp site.

GAGE GPS/GNSS Displacement Estimates
Coseismic offsets from this event were estimated by the GAGE GNSS ACC. Preliminary offsets were tabulated and published in an event (*.EVT) file available from the UNAVCO data products. At time of posting six sites were determined to have significant displacements. As more data and final orbits become available, the ACC will also produce a “final” offset solution, as well as offsets estimated from Kalman filter time series analyses. Final and Kalman filter offset files will be added to the event file at the event products ftp site. Any stations not processed in the initial rapid or final processing stages because the data were not available at the time may be included in supplemental processing runs.

NOTA Borehole Strainmeter Data
Fully processed 1-sps borehole strainmeter (BSM) dataset for this event has been produced. These datasets can be downloaded from the UNAVCO borehole strainmeter event response page. See figures 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.

Acknowledgements

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:
Lucea, Jamaica


 

Last modified: 2020-02-03  17:42:04  America/Denver