Abstract
1 Hz GPS data recorded by the GNSS network of the Consejería de Agricultura y Agua of the Murcia Region during the Mw 5.1 Lorca earthquake on May 11th 2011 is used as a test case. A Precise Point Positioning (PPP) approach is applied to analyse the earthquake-induced motion of the station LORC, located close to the epicenter. The results are validated using a conventional Double Differences (DD) processing. After applying sidereal and regional filters, the detected transient motion is about 20 millimeters in each component and clearly above noise level. The results from the two different processings are compared in view of the accuracy and applicability. The PPP approach described here can potentially be used for real-time analysis e.g. based on NTRIP streaming data. It may be used to set up an early warning system, as well as to gain real-time knowledge of ongoing earthquakes, extending the already-existing seismic information obtained from classical measurements.
Highlights
The Mw 5.1 Lorca earthquake that took place on 11th May 2011 was successfully recorded by one of the GPS receivers belonging to the local GPS network from the Consejería de Agricultura y Agua of the Murcia Region (Meristemum, http://gps.medioambiente.carm.es)
Precise Point Positioning (PPP) Results Computed by RTKLIB with Modified Sidereal Filter (MSF) and Regional Filter (RF). 4.3
The Lorca Earthquake observed by GPS: a Test Case for GPS Seismology
Summary
We have compared two different GPS processing strategies in order to extract earthquake waves from the position time series of GPS stations. The approach of Relative Positioning (Bernese software) with subsequent Sidereal Filtering was compared to Precise Point Positioning (RTKLIB) in combination with Sidereal and Regional Filtering These methods were used to analyze 1-Hz GPS observation data from Meristemum network recorded during the Lorca earthquake on May 11th, 2011 (Mw = 5.1). An additional Regional Filtering applied to the PPP solutions eventually led to better results (in terms of standard deviation, cf Table 2) than the DD approach with Sidereal Filtering This RF procedure was adapted to a high-rate GPS analysis using 1-Hz data. Even if all stations are affected by seismic displacements - implying that RF is no longer possible (cf section 5.2) - the PPP approach without RF (in contrast to DD) is still able to deliver valid absolute positions for the monitoring process. In the future this could be based on the presented PPP approach instead of DD processing, getting a reliable tool for earthquake early-warning and monitoring systems
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