In early February,2023,southeastern Türkiye and northern Syria were hit by a series of deadly earthquakes(two of them above magnitude 7.5)that are proving to be one of the most significant earthquake disasters of...In early February,2023,southeastern Türkiye and northern Syria were hit by a series of deadly earthquakes(two of them above magnitude 7.5)that are proving to be one of the most significant earthquake disasters of this century.These“twin quakes”caused a large number of casualties and property losses.As of press time,the death toll in Türkiye and Syria has surpassed 51000 and the number of injured has surpassed 120000,with the number affected>13.5 million.The toll is constantly rising and the hope of finding more survivors has rapidly faded.The USGS PAGER(United States Geological Survey,Prompt Assessment of Global Earthquake for Response)service estimates economic losses of 10–100 billion US dollars.展开更多
The paper presents the results of terrain subsidence monitoring in Poland's Upper Silesian Coal Basin(USCB)mining area using Differential Interferometry Synthetic Aperture Radar(DInSAR)and Persistent Scatterer Int...The paper presents the results of terrain subsidence monitoring in Poland's Upper Silesian Coal Basin(USCB)mining area using Differential Interferometry Synthetic Aperture Radar(DInSAR)and Persistent Scatterer Interferometry(PSI).The study area accounts for almost three million inhabitants where mining which started in the 19th century,has produced severe damage to buildings and urban infrastructures in past years.The analysis aimed to combine eight different datasets,processed in two techniques,coming from various sensors and covering different periods.As a result,a map of areas that have been exposed to subsidence within 3045 square kilometers was obtained.The map covers a period of twenty years of intensive mining activities,i.e.1992-2012.A total of 81 interferograms were used in the study.The interferograms allowed not only to determine subsidence troughs(basins)formed from 1992 to 2012 but also to observe subsidence development over time.The work also included five sets of PSI processing,covering different temporal and spatial ranges,which were used to determine zones of residual subsidence.Based on InSAR datasets,an area of 521 square kilometers under the influence of mining activities were determined.Within the subsiding zones,an area of 312.5 square kilometers of the rapid increase in subsidence was identified on the interferograms.The study of combined different InSAR datasets provided large-area and long-term information on the impact of mining activities in the Upper Silesia Coal Basin.展开更多
This study provides a comprehensive analysis of the recent volcanic seismic swarm in the southern Red Sea,specifically west of the Farasan Islands,southwest of Saudi Arabia.For a period of 7 days from July 29 to Augus...This study provides a comprehensive analysis of the recent volcanic seismic swarm in the southern Red Sea,specifically west of the Farasan Islands,southwest of Saudi Arabia.For a period of 7 days from July 29 to August 4,2025,the Saudi National Seismic Network(SNSN)recorded over 300 minor earthquakes,with local magnitudes(ML)ranging from 1.65 to 4.7 within latitude 16.6147 and longitude 41.2075(55 to 60 km west of the Farasan Islands).The swarm occurred in a vertical spreading at varying depths ranging from 4.5 to 30 km and included two earthquakes with local magnitudes of ML 4.33 and 4.7 at depths of 10 km and 13 km,respectively.The examination of the source mechanisms for the two largest earthquakes(ML=4.3,4.7)has revealed a normal mechanism that corresponds with the main direction of the Red Sea rift(northwest-southeast).Furthermore,the frequency contents of the majority of the swarm were measured at lower frequencies(below 1 Hz).According to the SNSN database,the recent swarm occurred in an area that had previously seen swarm activity and is located within a distance of 150 km from previous similar swarms that took place in 2007 and 2011 in the southern Red Sea.These similar swarms led to the formation of a new island on the northern edge of the Zubair Islands,which was called Al Jadid Island in 2011.The similarity between these swarms encompasses their number,depth range,vertical distribution,and eruption period to some extent.The results obtained indicated that the recent swarm is associated with volcanic activity,specifically a new magmatic intrusion that occurred beneath the middle of the southern Red Sea region.Thus,the possibility of the beginning of the formation of a new volcanic island in that location is raised.A hypothetical volcanic eruption scenario was developed,predicting heavy and light ash trajectories,potential threats to the Farasan Islands,southern Saudi Arabia,and other neighboring countries as a whole.展开更多
文摘In early February,2023,southeastern Türkiye and northern Syria were hit by a series of deadly earthquakes(two of them above magnitude 7.5)that are proving to be one of the most significant earthquake disasters of this century.These“twin quakes”caused a large number of casualties and property losses.As of press time,the death toll in Türkiye and Syria has surpassed 51000 and the number of injured has surpassed 120000,with the number affected>13.5 million.The toll is constantly rising and the hope of finding more survivors has rapidly faded.The USGS PAGER(United States Geological Survey,Prompt Assessment of Global Earthquake for Response)service estimates economic losses of 10–100 billion US dollars.
文摘The paper presents the results of terrain subsidence monitoring in Poland's Upper Silesian Coal Basin(USCB)mining area using Differential Interferometry Synthetic Aperture Radar(DInSAR)and Persistent Scatterer Interferometry(PSI).The study area accounts for almost three million inhabitants where mining which started in the 19th century,has produced severe damage to buildings and urban infrastructures in past years.The analysis aimed to combine eight different datasets,processed in two techniques,coming from various sensors and covering different periods.As a result,a map of areas that have been exposed to subsidence within 3045 square kilometers was obtained.The map covers a period of twenty years of intensive mining activities,i.e.1992-2012.A total of 81 interferograms were used in the study.The interferograms allowed not only to determine subsidence troughs(basins)formed from 1992 to 2012 but also to observe subsidence development over time.The work also included five sets of PSI processing,covering different temporal and spatial ranges,which were used to determine zones of residual subsidence.Based on InSAR datasets,an area of 521 square kilometers under the influence of mining activities were determined.Within the subsiding zones,an area of 312.5 square kilometers of the rapid increase in subsidence was identified on the interferograms.The study of combined different InSAR datasets provided large-area and long-term information on the impact of mining activities in the Upper Silesia Coal Basin.
文摘This study provides a comprehensive analysis of the recent volcanic seismic swarm in the southern Red Sea,specifically west of the Farasan Islands,southwest of Saudi Arabia.For a period of 7 days from July 29 to August 4,2025,the Saudi National Seismic Network(SNSN)recorded over 300 minor earthquakes,with local magnitudes(ML)ranging from 1.65 to 4.7 within latitude 16.6147 and longitude 41.2075(55 to 60 km west of the Farasan Islands).The swarm occurred in a vertical spreading at varying depths ranging from 4.5 to 30 km and included two earthquakes with local magnitudes of ML 4.33 and 4.7 at depths of 10 km and 13 km,respectively.The examination of the source mechanisms for the two largest earthquakes(ML=4.3,4.7)has revealed a normal mechanism that corresponds with the main direction of the Red Sea rift(northwest-southeast).Furthermore,the frequency contents of the majority of the swarm were measured at lower frequencies(below 1 Hz).According to the SNSN database,the recent swarm occurred in an area that had previously seen swarm activity and is located within a distance of 150 km from previous similar swarms that took place in 2007 and 2011 in the southern Red Sea.These similar swarms led to the formation of a new island on the northern edge of the Zubair Islands,which was called Al Jadid Island in 2011.The similarity between these swarms encompasses their number,depth range,vertical distribution,and eruption period to some extent.The results obtained indicated that the recent swarm is associated with volcanic activity,specifically a new magmatic intrusion that occurred beneath the middle of the southern Red Sea region.Thus,the possibility of the beginning of the formation of a new volcanic island in that location is raised.A hypothetical volcanic eruption scenario was developed,predicting heavy and light ash trajectories,potential threats to the Farasan Islands,southern Saudi Arabia,and other neighboring countries as a whole.
