Real‐time capture of seismic waves using high‐rate multi‐GNSS observations: Application to the 2015 <i>M<sub>w</sub></i> 7.8 Nepal earthquake

Geng, Tao; Xie, Xin; Fang, Rongxin; Su, Xing; Zhao, Qile; Liu, Gang; Li, Heng; Shi, Chuang; Liu, Jingnan

doi:10.1002/2015gl067044

Cited by 55 publications

(25 citation statements)

References 24 publications

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“…Precise point positioning has been demonstrated as a valuable technique for single stations positioning over continental and even global scale [2][3][4][5][6]. It has been considered as an effective tool for precise orbit determination of low Earth orbiting [7], real-time water vapor estimation [8], and determination of earthquake magnitude [9,10]. Precise point positioning can provide the coordinates with respect to a global reference frame (defined by the satellite orbits and clocks) so that its result cannot be affected by the displacement of the localized infrastructure.…”

Section: Introductionmentioning

confidence: 99%

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Xiao

Zhang

et al. 2018

Remote Sensing

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According to the advantages of the precise point positioning (PPP) and the double-differenced (DD) model based algorithm, a new method for the integration of DD integer ambiguity resolution into PPP is presented. This method uses the undifferenced ambiguity estimated with PPP computation and the DD ambiguity generated from the DD model based algorithm to realize the PPP ambiguity fixing. In the presented method, the selection of the undifferenced ambiguity bases on the ratio test of the DD ambiguity and the ratio values based weight is used in PPP processing. This ensures the quality of the used undifferenced ambiguity. To validate the presented method, two experiments are implemented using the ten days (11 to 20 August 2014) data from local and regional reference stations and the moved two receivers. The results of the presented strategy show that improvements are achieved in all three coordinate components. The 1-h, 2-h, and 4-h PPP results indicate that the mean relative improvements were about 19%, 18%, and 15% for north, east, and up components. These results also show that prominent improvements of 29%, 31%, and 25% for north, east, and up components were obtained when the ratio values based weight was used. The application of the presented method in the displacement monitoring was implemented with the experiment and it showed that the PPP estimation computed with the presented strategy benefits local or regional displacement monitoring and improves the detecting ability for displacement.

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Section: Introductionmentioning

confidence: 99%

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Xiao

Zhang

et al. 2018

Remote Sensing

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“…Displacements can be obtained from a single integration of velocities, which is subject to an induced trend in the displacements due to residual errors in the velocity estimates such as satellite orbit and clock errors, atmospheric errors, and multipath effects. By applying a method of detrending, displacements with centimeter‐level accuracy can be obtained (Benedetti et al, ; Branzanti et al, ; Colosimo et al, ; Geng et al, ; Hung et al, ). The variometric approach has advantages over relative positioning and PPP.…”

Section: Introductionmentioning

confidence: 99%

Broadband Velocities and Displacements From Integrated GPS and Accelerometer Data for High‐Rate Seismogeodesy

Shu

Fang

Geng

et al. 2018

Geophysical Research Letters

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We present a new method of integrating Global Positioning System (GPS) and accelerometer data for high‐rate seismogeodesy. This method is based on the GPS variometric approach which can obtain seismic waves in real time using only the readily available broadcast products and a single receiver. Collocated 1‐Hz GPS and 200‐Hz accelerometer data from the 2016 MW 7.8 Kaikōura earthquake were analyzed to verify the effectiveness of this method. Results reveal that this method can provide broadband and more accurate velocities and displacements qualified to detect P wave arrivals. Moreover, this method can effectively avoid the aliasing problem present in the 1‐Hz GPS waveforms. We therefore conclude that this new method can be a powerful tool to capture seismic waves in real time, which is crucial for the purpose of tsunami early warning and earthquake rapid response.

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“…Geng et al [15] first used 1 Hz BDS observations to measure ground motions induced by the 2015 Mw 7.8 Gorkha, Nepal earthquake. They employed the variometric approach to estimate the velocity time series and to reconstruct displacements by integrating the velocity time series.…”

Section: Introductionmentioning

confidence: 99%

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

Geng

Fang

et al. 2016

Sensors

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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.

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

Cited by 55 publications

References 24 publications

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Broadband Velocities and Displacements From Integrated GPS and Accelerometer Data for High‐Rate Seismogeodesy

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

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

Cited by 55 publications

References 24 publications

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Introduction of the Double-Differenced Ambiguity Resolution into Precise Point Positioning

Broadband Velocities and Displacements From Integrated GPS and Accelerometer Data for High‐Rate Seismogeodesy

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

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