The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ming Hao - One of the best experts on this subject based on the ideXlab platform.
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Crustal Movement and strain distribution in east asia revealed by gps observations
Scientific Reports, 2019Co-Authors: Ming Hao, Wenquan ZhuangAbstract:East Asia is bounded by the Indian plate to the southwest and the Pacific and Philippine plates to the east, and has undergone complex tectonic evolution since ~55 Ma. In this study, we collect and process three sources of GPS datasets, including GPS observations, GPS positioning time series, and published GPS velocities, to derive unified velocity and strain rate fields for East Asia. We observed southward Movement and arc-parallel extension along the Ryukyu Arc and propose that the maximum principal stress axis (striking NEE) in North China could be mainly induced by westward subduction of the Pacific plate and the southward Movement of the Ryukyu Arc. The large EW-trending sinistral shear zone that bounds North China has been created by eastward Movement of South China to the south and westward subduction of the Pacific plate to the north. GPS velocity profiles and strain rates also demonstrate that Crustal deformation in mainland China is controlled by northeastward collision of the Indian plate into Eurasia and westward subduction of the Pacific and Philippine Sea plates beneath Eurasia. In particular, the India-Eurasia continental collision has the most extensive impact, which can reach as far as the southern Lake Baikal. The viscous behavior of the subducting Pacific slab also drives interseismic deformation of North China. The Crustal deformation caused by Philippine oceanic subduction is small and is limited to the region between the southeast coast of mainland China and Taiwan island. However, the principal compressional strain around eastern Taiwan is the largest in the region.
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three dimensional Crustal Movement and the activities of earthquakes volcanoes and faults in hainan island china
Geodesy and Geodynamics, 2016Co-Authors: Ming Hao, Shangwu SongAbstract:Abstract Hainan Island is a seismic active region, where Qiongshan M7.5 earthquake occurred in 1605 and several seismic belts appeared in recent years, especially the NS trending seismic belt (NSB) located in the northeast part of the island. Here is also a magmatic active region. The lava from about 100 volcanoes covered more than 4000 km2. The latest eruptions occurred on Ma'anling–Lei Huling volcanoes within 10,000 years. The neotectonic Movement has been determined by geological method in the island and its adjacent areas. In the paper, the present-day 3D Crustal Movement is obtained by using Global Positioning System (GPS) data observed from 2009 to 2014 and leveling observations measured in 1970s and 1990s respectively. The results show the horizontal Movement is mainly along SEE direction relative to the Eurasian Plate. The velocities are between 4.01 and 6.70 mm/a. The tension rate near the NSB is less than 1 mm/a. The vertical Movement shows the island uplifts as a whole with respect to the reference benchmark Xiuyinggang. The average uplifting rate is 2.4 mm/a. The rates are 2–3 mm/a in the northwest and 3–5mm/a in the northwest. It shows the deformation pattern of the southwest island is upward relative to the northeast, which is different from the result inferred from the coastal change and GPS. Haikou and its adjacent region present a subsidence in a long time. The southern part of the middle segment of the Wangwu-Wenjiao fault uplifts relative to the northern. Meanwhile, the western part uplifts relative to the eastern NSB. The vertical Crustal motion and the two normal faults nearly correspond to the terrain. The NSB is located along the Puqiangang-Dazhibo fault, which is assessed as a segmented fault with a dip of 80°–90°and partly exposed. The 3D deformations and other studies reveal the present activities of earthquakes, volcanoes and the faults. The small earthquakes will still occur in the NS belt and the volcanoes are not active now.
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vertical Crustal Movement around the southeastern tibetan plateau constrained by gps and grace data
Earth and Planetary Science Letters, 2016Co-Authors: Ming Hao, Jeffrey T Freymueller, Qingliang Wang, Duxin Cui, Shanlan QinAbstract:Abstract Using measurements of continuous GPS stations and GRACE across the southeastern Tibetan Plateau, we found that the GRACE-derived vertical displacements are highly correlated with GPS-modeled vertical annual and semiannual displacements, which demonstrates that the vertical seasonal variations on ground surface are mainly caused by hydrological mass loading. After removing GRACE-modeled seasonal variations from the GPS time series, we used a stacking technique to filter out the common mode errors. Then we estimated the best noise model for the filtered time series, which can be best characterized by power law noise model. Finally, we determined the rates of vertical Crustal Movement of southeastern Tibetan Plateau. Our results suggest that the southeastern Tibetan Plateau is undergoing uplift, whereas the southern Sichuan–Yunnan fragment is subsiding with respect to the region to the north. The assumption of uniform extension throughout the crust does not explain the subsidence of southern Sichuan–Yunnan fragment.
Mamoru Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Activated seismicity by strain rate change in the Yaeyama region, south Ryukyu
Earth Planets and Space, 2018Co-Authors: Mamoru Nakamura, Ayumi KinjoAbstract:We evaluated the long-term strain rate by using continuous global navigation satellite system data of GEONET and compared it with seismicity activation between 1996 and 2017 near Iriomote Island, south Ryukyu arc. We analyzed the seismicity by using the epidemic-type aftershock sequence model to detect the timing when the seismicity had changed. The results revealed that the long-term shear strain rate had increased on around 2002 and around 2013, and this was accompanied by an increase in seismicity in both 2002 and 2013. The change in the shear strain rate in 2002 could be explained by the Crustal Movement induced by the 2002 afterslip in the area west of Iriomote Island. The change in the shear strain rate in 2013 could be explained by the post-seismic Crustal Movement induced by the dike intrusion that occurred during the earthquake swarm in the Okinawa Trough in April 2013. These findings suggest that the long-term seismicity near Iriomote Island is strongly affected by changes in the Crustal strain rate, which have occurred in the past in response to dike intrusions in the Okinawa Trough and slow earthquakes in the Ryukyu Trench.
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aseismic Crustal Movement in southern ryukyu trench southwest japan
Geophysical Research Letters, 2009Co-Authors: Mamoru NakamuraAbstract:[1] Anomalous Crustal deformation following the Mw = 7.1, March 31, 2002, Hualien earthquake was observed over 5 years using the global positioning system (GPS) network in the south Ryukyu Islands. The analysis showed an afterslip event at a depth of 30 km on the subducting Philippine Sea plate. The magnitude of the cumulative moment reached 7.4. The released moment of the afterslip exceeded the mainshock itself. The afterslip promoted Coulomb failure stress on the fault of the repeating slow slip events (SSEs) in the vicinity of the afterslip. The increase in the slip rate of the SSEs predicted through the change in the Coulomb failure stress is 13%. This is close to the observed increase in slip rate (19%) after the earthquake. This suggests that the afterslip had accelerated the slip rate of the SSEs after the earthquake.
Yoichiro Fujii - One of the best experts on this subject based on the ideXlab platform.
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distribution of vertical Crustal Movement rates in the tohoku district japan predicted by least squares collocation
Journal of Geodesy, 1997Co-Authors: Gamal Elfiky, Teruyuki Kato, Yoichiro FujiiAbstract:Least-squares prediction using an empirically deduced local covariance function was performed to investigate the temporal change in the rates of vertical Crustal Movements in the Tohoku district, Japan. Levelling data covering an area of approximately 450 × 275 km2 observed between 1966 and 1995 were used and the results shown in the form of contour maps. Firstly we derived a covariance function of the rates of vertical Crustal Movement with a Gaussian form function. We used this function to estimate the spatial distribution of the rates of vertical Crustal Movements. By the present method, a steady tilt of the Tohoku district to the east, toward the Japan Trench and an areal uplift in the southwestern part were well reproduced. Moreover, a significant temporal change in vertical Movement rates is clearly seen.
Shanlan Qin - One of the best experts on this subject based on the ideXlab platform.
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vertical Crustal Movement around the southeastern tibetan plateau constrained by gps and grace data
Earth and Planetary Science Letters, 2016Co-Authors: Ming Hao, Jeffrey T Freymueller, Qingliang Wang, Duxin Cui, Shanlan QinAbstract:Abstract Using measurements of continuous GPS stations and GRACE across the southeastern Tibetan Plateau, we found that the GRACE-derived vertical displacements are highly correlated with GPS-modeled vertical annual and semiannual displacements, which demonstrates that the vertical seasonal variations on ground surface are mainly caused by hydrological mass loading. After removing GRACE-modeled seasonal variations from the GPS time series, we used a stacking technique to filter out the common mode errors. Then we estimated the best noise model for the filtered time series, which can be best characterized by power law noise model. Finally, we determined the rates of vertical Crustal Movement of southeastern Tibetan Plateau. Our results suggest that the southeastern Tibetan Plateau is undergoing uplift, whereas the southern Sichuan–Yunnan fragment is subsiding with respect to the region to the north. The assumption of uniform extension throughout the crust does not explain the subsidence of southern Sichuan–Yunnan fragment.
Gamal Elfiky - One of the best experts on this subject based on the ideXlab platform.
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distribution of vertical Crustal Movement rates in the tohoku district japan predicted by least squares collocation
Journal of Geodesy, 1997Co-Authors: Gamal Elfiky, Teruyuki Kato, Yoichiro FujiiAbstract:Least-squares prediction using an empirically deduced local covariance function was performed to investigate the temporal change in the rates of vertical Crustal Movements in the Tohoku district, Japan. Levelling data covering an area of approximately 450 × 275 km2 observed between 1966 and 1995 were used and the results shown in the form of contour maps. Firstly we derived a covariance function of the rates of vertical Crustal Movement with a Gaussian form function. We used this function to estimate the spatial distribution of the rates of vertical Crustal Movements. By the present method, a steady tilt of the Tohoku district to the east, toward the Japan Trench and an areal uplift in the southwestern part were well reproduced. Moreover, a significant temporal change in vertical Movement rates is clearly seen.