South and north-dipping nodal planes from the U.S. Geological Survey moment tensor solution were used to invert global teleseismic body waves to reveal the source rupture process of the December 8, 2016, Mw6.0 Hutubi ...South and north-dipping nodal planes from the U.S. Geological Survey moment tensor solution were used to invert global teleseismic body waves to reveal the source rupture process of the December 8, 2016, Mw6.0 Hutubi earthquake. The results show that a compact pattern is the main feature of this event for only one main slip zone located at the hypocenter for both models, The slip distributions are dominated by a nearly pure-thrust fault, and there is no apparent surface rupture. The inversion revealed that the slip zone extends 10 km along strike and 12 km along dip. The released total seismic moment was about 9.0 -1017 Nm, corresponding to a magnitude of Mw6.0. It is difficult to solve for a best-fit rupture plane due to the sample slip pattern without obvious rupture directivity. This makes the far- field teleseismic data not sensitive enough to determine the fault geometric parameters. The source model of the reverse north-dipping plane fits well with the observed waveforms, and the results of the aftershock relocation outline a trend of north-dipping profiles, indicating the possibility of a reverse event. The inverted normal fault beneath the Qigu fold, interpreted by geological and seismic studies, may be the seismogenic fault for this reverse event.展开更多
The Hutubi M_S6.2 earthquake occurred on December 8, 2016, in Hutubi County,Xinjiang Uygur Autonomous Region, causing three people injured. The earthquake effected areas mainly included 25 townships and towns,plus Hut...The Hutubi M_S6.2 earthquake occurred on December 8, 2016, in Hutubi County,Xinjiang Uygur Autonomous Region, causing three people injured. The earthquake effected areas mainly included 25 townships and towns,plus Hutubi County and Manas County in Changji,Hutubi and Manas. The total effected area is 12,450 km^2. In this paper,we summarize the seismo-tectonic background and geomorphic features of the earthquake zone. Under the guidance of the standard "The Earthquake Site Works-Parts4: Assessment of Direct Loss",the damage to buildings and lifeline systems with various structural types are introduced,and we ultimately estimate the direct economic losses to mud-wood houses and the destruction of brick-wood houses. Our results indicate that"The Urban and Rural Seismic Safe Housing Project"played a key role in reducing this earthquake disaster.展开更多
The mainshock and aftershocks of the Hutubi M_S6.2 earthquake on December 8,2016 were relocated by applying the double difference method, and we relocated 477 earthquakes in the Hutubi region. The earthquake relocatio...The mainshock and aftershocks of the Hutubi M_S6.2 earthquake on December 8,2016 were relocated by applying the double difference method, and we relocated 477 earthquakes in the Hutubi region. The earthquake relocation results show that the aftershocks are distributed in the east-west direction towards the north side of the southern margin of the Junggar Basin fault,and are mainly distributed in the western region of the mainshock. The distance between the mainshock after relocation and the southern margin of the Junggar Basin fault is obviously shortened. Combined with the focal mechanism and the spatial distribution of the mainshock and aftershocks,it is inferred that the southern margin of the Junggar Basin fault is the main seismogenic structure of the Hutubi earthquake.展开更多
Based on the field investigation of 182 seismic hazard survey sites,combined with analysis of the aftershock sequence, focal mechanism, and seismo-tectonic background, we produced the seismic intensity map of the Hutu...Based on the field investigation of 182 seismic hazard survey sites,combined with analysis of the aftershock sequence, focal mechanism, and seismo-tectonic background, we produced the seismic intensity map of the Hutubi M_S6.2 earthquake. The seismic intensity of the magistoseismic area is degree Ⅷ,with the orientation of long axis of isoseismic contour lines east-west. The Qingshuihezi fault is considered as the seismogenic fault of Hutubi M_S6.2展开更多
Based on the field investigation of the building types and damage caused to them by the Hutubi M_S6.2 earthquake on December 8,2016,we analyzed the damage characteristics and causes for different types of buildings. I...Based on the field investigation of the building types and damage caused to them by the Hutubi M_S6.2 earthquake on December 8,2016,we analyzed the damage characteristics and causes for different types of buildings. In conclusion we put forward some suggestions for the restoration and reconstruction in the earthquake affected area in future.展开更多
On the basis of the comparison data of Stage II of the tunnel site leveling project at Hutubi seismic station and the observation data of Stage IV of the site cross fault leveling project at Hutubi and the level obser...On the basis of the comparison data of Stage II of the tunnel site leveling project at Hutubi seismic station and the observation data of Stage IV of the site cross fault leveling project at Hutubi and the level observation data from the cross fault survey lines in Dafeng from 1987 to 2012,this paper analyses the variation rates of the tunnel site leveling observation results and the difference of annual change rates of the cross fault level observations at Hongshan seismic station in Hutubi. This paper concludes the reliability of the Ni004 optical level used by the station and puts forward a proposal based on the analysis. This paper also explores the cross fault leveling research on the ground deformation in the region concerned on the basis of the historical observation of the cross fault level at Dafeng and the comparison results of the tunnel site leveling observation in Hutubi.展开更多
Hutubi Underground Gas Storage(UGS) is an important part of China’s West-East Gas Pipeline Project. Its production safety also plays an essential role in ensuring peaking,emergency and reserve of natural gas in the r...Hutubi Underground Gas Storage(UGS) is an important part of China’s West-East Gas Pipeline Project. Its production safety also plays an essential role in ensuring peaking,emergency and reserve of natural gas in the region. Geophysical observations and research conducted on Hutubi UGS provide significant support for understanding the operation status and ensuring safe operation of the UGS. Since the beginning of the construction of Hutubi UGS and its production,several works including gas field observation experiments,rock experiments and numerical simulations have been conducted. Preliminary observational results show that during the initial operation stage of the UGS,the "breathing phenomenon"in caprock and microseismicity in the vicinity are closely related to the operation of the gas storage. However,rock experiments and numerical simulations show that these activities may gradually weaken with the multi-cycle operation of gas storage. The impact of the operation of Hutubi UGS in the surrounding areas is gradually weakening,and its operation tends to be stable. Implementing long-term and multi-method geophysical observations is able to provide us a better understanding of the relationship between the operation of UGS and regional geological hazards. On this basis,the corresponding geomechanical model can be established to form an effective risk management mechanism for gas storage operation. Thus,it is of great significance to understand its operation status,monitor storage conditions,guide production and operation,and ultimately guarantee the safe production of the gas storage.展开更多
基金supported by the Director Foundation of Institute of Seismology, CEA (Grant Number: IS201326127)the National Natural Science Foundation of China (Grant Numbers: 41404016, 41474097)
文摘South and north-dipping nodal planes from the U.S. Geological Survey moment tensor solution were used to invert global teleseismic body waves to reveal the source rupture process of the December 8, 2016, Mw6.0 Hutubi earthquake. The results show that a compact pattern is the main feature of this event for only one main slip zone located at the hypocenter for both models, The slip distributions are dominated by a nearly pure-thrust fault, and there is no apparent surface rupture. The inversion revealed that the slip zone extends 10 km along strike and 12 km along dip. The released total seismic moment was about 9.0 -1017 Nm, corresponding to a magnitude of Mw6.0. It is difficult to solve for a best-fit rupture plane due to the sample slip pattern without obvious rupture directivity. This makes the far- field teleseismic data not sensitive enough to determine the fault geometric parameters. The source model of the reverse north-dipping plane fits well with the observed waveforms, and the results of the aftershock relocation outline a trend of north-dipping profiles, indicating the possibility of a reverse event. The inverted normal fault beneath the Qigu fold, interpreted by geological and seismic studies, may be the seismogenic fault for this reverse event.
基金funded by the Key Youth Task of Earthquake Emergency,China Earthquake Administration(CEA_EDEM-201719)
文摘The Hutubi M_S6.2 earthquake occurred on December 8, 2016, in Hutubi County,Xinjiang Uygur Autonomous Region, causing three people injured. The earthquake effected areas mainly included 25 townships and towns,plus Hutubi County and Manas County in Changji,Hutubi and Manas. The total effected area is 12,450 km^2. In this paper,we summarize the seismo-tectonic background and geomorphic features of the earthquake zone. Under the guidance of the standard "The Earthquake Site Works-Parts4: Assessment of Direct Loss",the damage to buildings and lifeline systems with various structural types are introduced,and we ultimately estimate the direct economic losses to mud-wood houses and the destruction of brick-wood houses. Our results indicate that"The Urban and Rural Seismic Safe Housing Project"played a key role in reducing this earthquake disaster.
基金supported by the Science for Earthquake Resilience,China Earthquake Administration(XH17043Y)the Basic Scientific Research Expenses of Institute of Geophysics,China Earthquake Administration(DQJB16A04)+1 种基金the Special Tasks of Youth Backbone Training of Seismic Network,China Earthquake Administration(20170627)the Earthquake Science Foundation of Xinjiang(201711)
文摘The mainshock and aftershocks of the Hutubi M_S6.2 earthquake on December 8,2016 were relocated by applying the double difference method, and we relocated 477 earthquakes in the Hutubi region. The earthquake relocation results show that the aftershocks are distributed in the east-west direction towards the north side of the southern margin of the Junggar Basin fault,and are mainly distributed in the western region of the mainshock. The distance between the mainshock after relocation and the southern margin of the Junggar Basin fault is obviously shortened. Combined with the focal mechanism and the spatial distribution of the mainshock and aftershocks,it is inferred that the southern margin of the Junggar Basin fault is the main seismogenic structure of the Hutubi earthquake.
基金funded by the Natural Science Foundation of Xinjiang Uygur Autonomous Region(2017D01A66)
文摘Based on the field investigation of 182 seismic hazard survey sites,combined with analysis of the aftershock sequence, focal mechanism, and seismo-tectonic background, we produced the seismic intensity map of the Hutubi M_S6.2 earthquake. The seismic intensity of the magistoseismic area is degree Ⅷ,with the orientation of long axis of isoseismic contour lines east-west. The Qingshuihezi fault is considered as the seismogenic fault of Hutubi M_S6.2
基金sponsored by the Key Youth Emergency Task,China Earthquake Administration(CEA_EDEM_201620)
文摘Based on the field investigation of the building types and damage caused to them by the Hutubi M_S6.2 earthquake on December 8,2016,we analyzed the damage characteristics and causes for different types of buildings. In conclusion we put forward some suggestions for the restoration and reconstruction in the earthquake affected area in future.
基金sponsored by the Natural Science Foundation of Xinjiang Uighur Autonomous Region2012211B56)the Natural Science Foundation of China(41374031)the Earthquake Science and Technology Spark Plan(XH1030),and the Earthquake Science and Technology Spark Progam XH14054Y)
文摘On the basis of the comparison data of Stage II of the tunnel site leveling project at Hutubi seismic station and the observation data of Stage IV of the site cross fault leveling project at Hutubi and the level observation data from the cross fault survey lines in Dafeng from 1987 to 2012,this paper analyses the variation rates of the tunnel site leveling observation results and the difference of annual change rates of the cross fault level observations at Hongshan seismic station in Hutubi. This paper concludes the reliability of the Ni004 optical level used by the station and puts forward a proposal based on the analysis. This paper also explores the cross fault leveling research on the ground deformation in the region concerned on the basis of the historical observation of the cross fault level at Dafeng and the comparison results of the tunnel site leveling observation in Hutubi.
基金sponsored by the National Key R&D Program of China(2016YFE0109300)National Natural Science Foundation of China(41561164018)Basic Research Funds from the Institute of Geophysics,China Earthquake Administration(DQJB17T04)。
文摘Hutubi Underground Gas Storage(UGS) is an important part of China’s West-East Gas Pipeline Project. Its production safety also plays an essential role in ensuring peaking,emergency and reserve of natural gas in the region. Geophysical observations and research conducted on Hutubi UGS provide significant support for understanding the operation status and ensuring safe operation of the UGS. Since the beginning of the construction of Hutubi UGS and its production,several works including gas field observation experiments,rock experiments and numerical simulations have been conducted. Preliminary observational results show that during the initial operation stage of the UGS,the "breathing phenomenon"in caprock and microseismicity in the vicinity are closely related to the operation of the gas storage. However,rock experiments and numerical simulations show that these activities may gradually weaken with the multi-cycle operation of gas storage. The impact of the operation of Hutubi UGS in the surrounding areas is gradually weakening,and its operation tends to be stable. Implementing long-term and multi-method geophysical observations is able to provide us a better understanding of the relationship between the operation of UGS and regional geological hazards. On this basis,the corresponding geomechanical model can be established to form an effective risk management mechanism for gas storage operation. Thus,it is of great significance to understand its operation status,monitor storage conditions,guide production and operation,and ultimately guarantee the safe production of the gas storage.
