Determination of earthquake magnitude using GPS displacement waveforms from real-time precise point positioning

Fang, Rongxin; Shi, Chuang; Song, Weiwei; Wang, Guangxing; Liu, Jingnan

doi:10.1093/gji/ggt378

Cited by 49 publications

(22 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although seismic velocity waveforms can be utilized for locating seismic sources (e.g., determining the hypocentral coordinates and the source origin time) [ Lay and Wallace , ] and other applications (e.g., PGV shakemap predictions) [ Dreger and Kaverina , ], the displacements induced by earthquakes are also valuable to rapidly compute the magnitude without saturating [ Fang et al ., ; Melgar et al ., ] and model the rupture process [ Yue and Lay , ]. With seismic data, displacements can be obtained through a single integration of velocity or a double integration of accelerometer data.…”

Section: Resultsmentioning

confidence: 99%

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

Geng

Xie

Fang

et al. 2016

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

The variometric approach is investigated to measure real‐time seismic waves induced by the 2015 Mw 7.8 Nepal earthquake with high‐rate multi‐GNSS observations, especially with the contribution of newly available BDS. The velocity estimation using GPS + BDS shows an additional improvement of around 20% with respect to GPS‐only solutions. We also reconstruct displacements by integrating GNSS‐derived velocities after a linear trend removal (IGV). The displacement waveforms with accuracy of better than 5 cm are derived when postprocessed GPS precise point positioning results are used as ground truth, even if those stations have strong ground motions and static offsets of up to 1–2 m. GNSS‐derived velocity and displacement waveforms with the variometric approach are in good agreement with results from strong motion data. We therefore conclude that it is feasible to capture real‐time seismic waves with multi‐GNSS observations using the IGV‐enhanced variometric approach, which has critical implications for earthquake early warning, tsunami forecasting, and rapid hazard assessment.

show abstract

Section: Resultsmentioning

confidence: 99%

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

Geng

Xie

Fang

et al. 2016

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…For future research we plan to investigate the real-time clock estimation approach for real-time applications, such as rapid determination of earthquake magnitude [28], earthquake early warning [29], and rapid hazard assessment [30]. …”

Section: Discussionmentioning

confidence: 99%

BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections

Geng

Fang

et al. 2016

Sensors

Self Cite

View full text Add to dashboard Cite

In order to satisfy the requirement of high-rate high-precision applications, 1 Hz BeiDou Navigation Satellite System (BDS) satellite clock corrections are generated based on precise orbit products, and the quality of the generated clock products is assessed by comparing with those from the other analysis centers. The comparisons show that the root mean square (RMS) of clock errors of geostationary Earth orbits (GEO) is about 0.63 ns, whereas those of inclined geosynchronous orbits (IGSO) and medium Earth orbits (MEO) are about 0.2–0.3 ns and 0.1 ns, respectively. Then, the 1 Hz clock products are used for BDS precise point positioning (PPP) to retrieve seismic displacements of the 2015 Mw 7.8 Gorkha, Nepal, earthquake. The derived seismic displacements from BDS PPP are consistent with those from the Global Positioning System (GPS) PPP, with RMS of 0.29, 0.38, and 1.08 cm in east, north, and vertical components, respectively. In addition, the BDS PPP solutions with different clock intervals of 1 s, 5 s, 30 s, and 300 s are processed and compared with each other. The results demonstrate that PPP with 300 s clock intervals is the worst and that with 1 s clock interval is the best. For the scenario of 5 s clock intervals, the precision of PPP solutions is almost the same to 1 s results. Considering the time consumption of clock estimates, we suggest that 5 s clock interval is competent for high-rate BDS solutions.

show abstract

“…To simulate data processing in a real‐time mode, real‐time precise satellite orbits and clock products are required. In this contribution, we generated them by positioning and navigation data analyst software [ Liu and Ge , ]; for detailed estimation strategy, please refer to Fang et al []. Station distribution of the continuous GPS network is depicted in Figure .…”

Section: Retrieving Coseismic Offsets From Real‐time Gps Waveformsmentioning

confidence: 99%

Comparing source inversion techniques for GPS‐based local tsunami forecasting: A case study for the April 2014 M8.1 Iquique, Chile, earthquake

Chen

Babeyko

Hoechner

et al. 2016

Geophysical Research Letters

View full text Add to dashboard Cite

Real‐time GPS is nowadays considered as a valuable component of next generation near‐field tsunami early warning systems able to provide fast and reliable source parameters. Looking for optimal methodologies and assessing corresponding uncertainties becomes an important task. We take the opportunity and consider the 2014 Pisagua event as a case study to explore tsunami forecast uncertainty related to the GPS‐based source inversion. We intentionally neglect all other sources of uncertainty (observation set, signal processing, wave simulation, etc.) and exclusively assess the effect of inversion technique. In particular, we compare three end‐member methods: (1) point‐source fastCMT (centroid moment tensor), (2) distributed slip along predefined plate interface, and (3) unconstrained inversion into a single uniform slip finite fault. The three methods provide significantly different far‐field tsunami forecast but show surprisingly similar tsunami predictions in the near field.

show abstract

Determination of earthquake magnitude using GPS displacement waveforms from real-time precise point positioning

Cited by 49 publications

References 36 publications

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections

Comparing source inversion techniques for GPS‐based local tsunami forecasting: A case study for the April 2014 M8.1 Iquique, Chile, earthquake

Contact Info

Product

Resources

About

Determination of earthquake magnitude using GPS displacement waveforms from real-time precise point positioning

Cited by 49 publications

References 36 publications

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 Mw 7.8 Nepal earthquake

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 Mw 7.8 Nepal earthquake

BDS Precise Point Positioning for Seismic Displacements Monitoring: Benefit from the High-Rate Satellite Clock Corrections

Comparing source inversion techniques for GPS‐based local tsunami forecasting: A case study for the April 2014 M8.1 Iquique, Chile, earthquake

Contact Info

Product

Resources

About

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake

Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 M_w 7.8 Nepal earthquake