Written by David Phillips and Beth Bartel
21 February 2018
A Mw 7.2 earthquake occurred at 23:39:42 UTC on February 16, 2018 (16:39:42 February 16, 2018 local) 37km NE of Pinotepa, Mexico.
For more information, see the USGS Earthquake Hazards Program event page.
GPS/GNSS Real-time Data Streams
Signals from this event were recorded by 23 GPS/GNSS stations operated by UNAVCO, UNAM and collaborators that were streaming high rate (1-sps / 1 Hz) data in real time (Figures 2 and 3). These data allow peak ground displacements (PGD) to be calculated automatically from the displacement traces within seconds of the earthquake (Figure 3). Note: figures and findings are preliminary and subject to revision.
GPS/GNSS Real-time Stations Used
In order of increasing distance from epicenter: TNPJ, TGIG, DEMA, ZIHU, UNTO, UJUR, MXAS, UXAL, MARO, TNAL, YAIG, POPI, CAYA, IGUA, UTON, OXTH, DOAR, OXUM, CRIG, TNSJ, OAXA, OXPE, PEIG.
GPS/GNSS Data - Custom Downloads for Post Processing
UNAVCO downloaded high-rate 1-sps (1 Hz) and 5-sps (5 Hz) data from 27 GPS/GNSS stations operated by UNAVCO, UNAM and collaborators within 1,000 km of the epicenter for a 6-hour time window around the event (± 3 hours). A map of GPS stations being downloaded is shown in Figure 2. These data are available from the UNAVCO high rate data ftp site.
The GAGE GPS Analysis Center Coordinator (ACC), Professor Tom Herring (MIT), is estimating preliminary coseismic offsets associated with this earthquake. When analyses are complete, estimated offsets will be tabulated and published in an event (*.EVT) file available from the UNAVCO data products ftp site. As more data 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.
Borehole Strainmeter Data
UNAVCO has produced a fully processed 1-sps borehole strainmeter (BSM) dataset spanning the time period of this event, available from the PBO borehole strainmeter event response page.
This response includes data provided by TLALOCNet and SSN-TLALOCNet GPS networks jointly operated by UNAVCO, Servicio de Geodesia Satelital (SGS) and Servicio Sismologico Nacional (SSN) from Instituto de Geofísica-UNAM. These networks are supported by grants from NSF EAR-1338091, CONACyT 253760, UNAM-PAPIIT IN104213, IN109315-3, IA101913 with additional support from Instituto de Geofísica. Field and IT support was provided by UNAVCO, SGS and SSN personnel.
Last modified: Thursday, 08-Mar-2018 23:05:24 UTC