Analysis and study of the geometrical structure of the fault, tectonic features of late Quaternary movement, paleoseismic activity, and structural characteristics of boundaries between segments of the Sertengshan pied...Analysis and study of the geometrical structure of the fault, tectonic features of late Quaternary movement, paleoseismic activity, and structural characteristics of boundaries between segments of the Sertengshan piedmont fault permitted us to preliminarily determine the following 4 active segments of the fault: the Wujiahe segment (from Dongwugai Gully to Dahoudian Village), Wujumengkou Dongfeng Village segment (from Dahoudian to Delingshan), Dashetai segment (from Delingshan to Xiaoshetai Gully mouth), and the Ulan Hudong segment (from Xiaoshetai Gully mouth to Tailiang). The boundaries between them are the Dagoudian mountain spur, the Delingshan Mountain spur and the step zone at Xiaoshetai Gully mouth, respectively. The segments are independent for seismic activity. However, it is possible that joint ruptures between Wujiahe and Wujumengkou Dongfeng Village segments and between Dashetai and Ulan Hudong segments may occur.展开更多
The two eastern segments of the Sertengshan piedmont fault have moved considerably since the Holocene. Several paleoseismic events have occurred along the fault since 30 ka BP. Pa- leoearthquake studies have been adva...The two eastern segments of the Sertengshan piedmont fault have moved considerably since the Holocene. Several paleoseismic events have occurred along the fault since 30 ka BP. Pa- leoearthquake studies have been advanced by digging new trenches and combining the results with the findings of previous studies. Comprehensive analyses of the trenches revealed that 6 paleoseismic events have occurred on the Kuoluebulong segment since approximately 30 ka BP within the following successive time periods： 19.01-37.56, 18.73, 15.03-15.86, 10.96, 5.77-6.48, and 2.32 ka BP. The analyses also revealed that 6 paleoseismic events have occurred on the Dashetai segment since approximately 30 ka BP, and the successive occurrence times are 29.07, 19.12-28.23, 13.92-15.22, 9.38-9.83, 6.08--8.36, and 3.59 ka BP. The results indicate that quasi-periodic recurrences occurred along the two segments with an approximate 4 000 a mean recurrence interval. The consistent timing of the 6 events between the two segments indicates that the segments might conform to the cascade rupturing model between the two segments. As recorded by a large number of Chinese historical texts, the latest event on the Kuoluebulong segment is the historical M 8.0 earthquake occurred on November U, 7 BC.展开更多
基金TheresearchwassupportedunderaprojectofStateKeyBasicResearchandDevelopmentPlan (G1 9980 4 0 7) China .
文摘Analysis and study of the geometrical structure of the fault, tectonic features of late Quaternary movement, paleoseismic activity, and structural characteristics of boundaries between segments of the Sertengshan piedmont fault permitted us to preliminarily determine the following 4 active segments of the fault: the Wujiahe segment (from Dongwugai Gully to Dahoudian Village), Wujumengkou Dongfeng Village segment (from Dahoudian to Delingshan), Dashetai segment (from Delingshan to Xiaoshetai Gully mouth), and the Ulan Hudong segment (from Xiaoshetai Gully mouth to Tailiang). The boundaries between them are the Dagoudian mountain spur, the Delingshan Mountain spur and the step zone at Xiaoshetai Gully mouth, respectively. The segments are independent for seismic activity. However, it is possible that joint ruptures between Wujiahe and Wujumengkou Dongfeng Village segments and between Dashetai and Ulan Hudong segments may occur.
基金supported by the Institute of Crustal Dynamics, China Earthquake Administration (No. ZDJ2016-11)the National Natural Science Foundation of China (No. 41602221)the 1 : 50 000 Geological Mapping of the Sertengshan Piedmont Fault (No. 201408023)
文摘The two eastern segments of the Sertengshan piedmont fault have moved considerably since the Holocene. Several paleoseismic events have occurred along the fault since 30 ka BP. Pa- leoearthquake studies have been advanced by digging new trenches and combining the results with the findings of previous studies. Comprehensive analyses of the trenches revealed that 6 paleoseismic events have occurred on the Kuoluebulong segment since approximately 30 ka BP within the following successive time periods： 19.01-37.56, 18.73, 15.03-15.86, 10.96, 5.77-6.48, and 2.32 ka BP. The analyses also revealed that 6 paleoseismic events have occurred on the Dashetai segment since approximately 30 ka BP, and the successive occurrence times are 29.07, 19.12-28.23, 13.92-15.22, 9.38-9.83, 6.08--8.36, and 3.59 ka BP. The results indicate that quasi-periodic recurrences occurred along the two segments with an approximate 4 000 a mean recurrence interval. The consistent timing of the 6 events between the two segments indicates that the segments might conform to the cascade rupturing model between the two segments. As recorded by a large number of Chinese historical texts, the latest event on the Kuoluebulong segment is the historical M 8.0 earthquake occurred on November U, 7 BC.
