Aizhi Guo

• Dr
• Professor (Associate) at Innovation Academy of Precision Measurement Science and Technology，Chinese Academy of Sciences( i.e. former Institute of Geodesy and Geophysics， Chinese Academy of Sciences

The Haiyuan fault system plays a crucial role in accommodating the eastward expansion of the Tibetan Plateau (TP) and is currently slipping at a rate of several centimeters per year. However, limited seismic activities have been observed using geodetic techniques in this area, impeding the comprehensive investigation into regional tectonics. In thi...

Although the Sichuan basin is a stable block with low historical seismicity, the Suining M5.0 earthquake on January 31, 2010 occurred near the center of the basin, causing casualty and substantial damage. Previous studies have shown that the earthquake is very shallow and may occur in the sedimentary cover rocks, but its causative fault has not bee...

For the geoscience community, a cross-platform open-source PPP toolbox named PPP-ARISEN is developed, which can realize ambiguity resolution (AR) based on integer phase clock (IPC) method with satellite-to-satellite single difference (SSD) strategy and now is compatible with both CODE (Center for Orbit Determination in Europe) and CNES (Centre Nati...

Low earth orbit satellites (LEOs) play an important role in communications, Earth observation and other applications. The real-time precise orbit determination (RTPOD) of LEOs plays an important role. However, the quality of carrier observations must be strictly controlled for the RTPOD of LEO satellites. Nevertheless, the ionospheric residual (IR)...

The gravity field is one of the Earth’s basic physical fields. The geoid can be calculated and the tectonic activity underground can be inversed by gravity anomaly. With the development of various ship-borne gravimeters and navigation technology, including the Global Navigation Satellite System (GNSS) and Strapdown Inertial Navigation System (SINS)...

The continuous uplift and evolution of the Qinghai‐Tibet Plateau region (TPR) represents one of the most important Cenozoic geological events on Earth. The deformation mechanism of the lithosphere in the TPR is still under debate. Relevant viewpoints can be informed by investigations of the lithospheric density structure in the Qinghai‐Tibet Platea...

To meet the demands of research and precise point positioning (PPP) in a multi-GNSS environment, we developed a GNSS data processing software named multi-GNSS automatic precise positioning software (MG-APP). MG-APP is an open-source software that can be run on Windows/Linux/UNIX and other operating systems. It can simultaneously process GPS/GLONASS...

In this paper, a heterogeneous comprehensive learning and dynamic multi-swarm particle swarm optimizer with two mutation operators (HCLDMS-PSO) is presented. In addition, a comprehensive learning (CL) strategy with the global optimal experience of the whole population is conducted to generate an exploitation subpopulation exemplar. However, a modif...

High-rate GPS networks have proven to be capable of continuously recording strong ground motion, which is valuable for studying earthquake rupture processes and seismic hazard mitigation. Previous studies of high-rate GPS usually resolved dynamic ground displacements of some major seismic phases stronger than a few millimeters. In this study, we ex...

The Mw 7.8 Kaikōura earthquake on 13 November 2016 is one of the most complex events ever recorded, with surface rupture found on more than a dozen faults. Within about 10 minutes after the mainshock, an Mw 5.8 event occurred and caused an 8 cm static displacement at high-rate Global Positioning System (GPS) station KAIK, which was not accounted fo...

The merged GPS navigation files from the International GNSS Service (IGS) data centers, i.e., the Crustal Dynamics Data Information System (CDDIS), the Bundesamt für Kartographie und Geodäsie (BKG), the Scripps Institution of Oceanography (SIO), and the Institut Geographique National (IGN) are occasionally contaminated by anomalies and inconsistent...

The high-rate GPS data recorded detailed information of the static offset and the seismic wave when the earthquake occurred.Accurate separation is very important for the rapid inversion and disaster assessment after earthquake.In this paper, the smoothness priors method (SPM) was introduced to deal with the high-rate GPS data.Through the processing...

The Xishancun Landslide is located in the Longmenshan Mountains where the 2008 Wenchuan earthquake occurred. The 2008 Wenchuan earthquake triggered a large number of landslides in this region. Since then, the Xishancun Landslide is continuously deforming. In order to monitor slidequakes generated by the slope movement and the internal fracturing of...

https://doi.org/10.1093/gji/ggx464 It is known that a receiver function has relatively weak constraint on absolute seismic wave velocity, and that joint inversion of the receiver function with surface wave dispersion has been widely applied to reduce the trade-off of velocity with interface depth. However, some studies indicate that the receiver f...

In this study, we demonstrate an approach for inverting earthquake source parameters based on high-rate global positioning system (GPS) velocity seismograms. The velocity records obtained from single-station GPS velocity solutions with broadcast ephemeris are used directly for earthquake source parameter inversion using the Cut and Paste method, wi...

This paper focuses on the research of resolving static offset from high-rate GPS data by wavelet decomposition-reconstruction algorithm. After processing and analyzing the high-rate GPS data of El Mayor-Cucapah earthquake and Tohuko-Oki earthquake in precise point positioning (PPP) mode, we find that the short-period waveforms captured by high-rate...

We collected high-rate GPS data (1-Hz) from 192 stations in China recording the Tohoku-Oki earthquake. Not only do we retrieve P, S, and surface waves, but we also retrieve the outercore-reflected ScS wave. This inference is supported by comparison with both seismographic records and the synthetic waveforms. However, it is still challenging to incl...