Quantifying Preferential Flow during Rainfall and Irrigation in the North China Plain     

WU Qinghu  LIU Chun Lei  ZHANG Wei  WANG Guiling 《《地质学报》英文版》2013,87(Z1):657-657

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Tectonic Features of the M_S8.0 Wenchuan Earthquake and Its Aftershocks     

Tian Qinjian    Diao Guiling  Hao Ping  Feng Xiangdong  Sun Qing 《中国地震研究》2009,23(4):383-391

The M8.0 Wenchuan earthquake occurred on the Longmenshan fault zone. Based on field investigation of the surface rupture and focal mechanism study of the aftershocks, we discuss the geological relationship of the main, secondary and triggered ruptures. The main rupture is about 200km long and can be divided into the south part and the north part. The south part consists of two parallel fault zones characterized by reverse faulting, with several parallel secondary ruptures on the hanging wall of the main fault, and the north part is a single main fault zone characterized by lateral strike-slip and reverse faulting. Compared to a 300km long aftershock distribution, the surface rupture only occupies 200km, and the remaining 100km on the northeast of the main rupture was triggered by aftershocks. Study on the ruptures of this earthquake will be useful for studying the earthquake risk evolution on the Longmenshan fault system.  相似文献   

我国干热岩资源分布及勘探:进展与启示   总被引：3，自引：0，他引：3  

蔺文静  王贵玲  邵景力  甘浩男  谭现锋 《地质学报》2021,95(5):1366-1381

干热岩是地热资源的重要赋存形式之一,是未来地热开发的主攻方向.我国干热岩勘查工作近年来进展迅速,先后在不同地区发现了优质的干热岩资源,取得了我国干热岩资源勘查突破,但同时也存在不少勘查失败的案例.本文在分析高放射性产热型、沉积盆地型、近代火山型和强烈构造活动带型等四种类型干热岩成因模式的基础上,结合我国的地质构造背景、...  相似文献   

Genesis of Geothermal Fluid in Typical Geothermal Fields in Western Sichuan,China     

ZHAO Jiayi  WANG Guiling  ZHANG Cuiyun  XING Linxiao  LI Man  ZHANG Wei 《《地质学报》英文版》2021,95(3):873-882

The hydrogeochemical characteristics of geothermal fluids can reveal the genesis of geothermal systems and act as important references for developing and using geothermal resources.This study presents hydrogeochemical processes and thermal cycle mechanisms of typical geothermal fields in Western Sichuan.Based on the geological conditions in Western Sichuan,29 hot springs in three geothermal fields in the Batang and Litang areas were selected for hydrochemical and isotopic (δD andδ~(18)O) analyses.Furthermore,the temperature of the thermal reservoir was calculated and the upflow cooling process of the hot springs was analyzed.Most of the subterranean hot waters in Batang and Litang are of the HCO_3-Na hydrochemical type.The ion variation in Batang is primarily affected by water-rock interactions.There is a strong positive correlation between Na~+,B~-,and Cl~-in Litang,suggesting that they have the same material source.The Na~+and metaboric acid content is relatively high,which indicates that the groundwater runoff in both areas is relatively long-lasting,with reduced flow velocity;moreover,the metasilicic acid content is relatively high,which supports this conclusion.Both hydrogen and oxygen isotopes plot near the atmospheric precipitation line,indicating that groundwater recharge is functionally obtained from precipitation.The calculated thermal storage temperatures in Batang and Litang were 88–199°C and 96–154°C,respectively.The proportion of cold water mixing in Batang was 64%–67%,while that in Litang was 60%–68%.According to the calculated results,the initial thermal cycle depth of the Batang area (4540–4780 m) was greater than that of the Litang area (3150–3960 m).The enthalpy of the deep parental geothermal fluid in Batang was 1550 J/g with a Cl~-concentration of 37 mg/L,while that in Litang was 2100 J/g with a Cl~-concentration of 48 mg/L.  相似文献   

强余震“等待时间”判别方案预报效能的研究     

华爱军  刁守中  王红卫 《大地测量与地球动力学》1996,(2)

通过系统清理１９９６年以来中国大陆７０个Ｍｓ≥５．５级地震序列的＂强余震＂Ｌｇ△ｔ－Ｌｇｔ关系，对强余＂等待时间＂判别方案预报效能进行了评估。结果表明，其回顾性预报的Ｗａｌｌｅｎ评分为：６级以上地震序列Ｖ＝０．６０，５．５级以上地震序列为０．４４，说明其在地震序列类型判断方面有一定的效能。对实际震例分析得出，该方案在判定主余型序列方面成功率较高，而对于双震或多震序列，有时会产生某些误判；对６级以上地震序列的预测成功率高一些，对低震级的序列判断应慎重。  相似文献   

1990年6月14日苏联斋桑湖7.3级地震和两次强余震前富蕴地震窗的异常及其预报     

王桂岭  敖雪明 《地震工程学报》1992,14(1):79-81,77

近年来,地震窗预报方法已在国内广为应用。富蕴地震窗系笔者在王泽皋、姜秀娥等人工作的基础上^[1-3],于1984年在全国地震预报清理攻关中建立,在1987-1988年全国地震预报实用化攻关中又得以进一步深化和完善^[4]。  相似文献   

Modern sediment characteristics and accumulation rates from the delta front to prodelta of the Yellow River (Huanghe)   总被引：2，自引：0，他引：2  

Liangyong Zhou  Jian Liu  Yoshiki Saito  Maosheng Gao  Shaobo Diao  Jiandong Qiu  Shaofeng Pei 《Geo-Marine Letters》2016,36(4):247-258

Since 1976, the main channel of the Yellow River (Huanghe) has been on the east side of the delta complex, and the river has prograded a broad new delta lobe in Laizhou Bay of the Bohai Sea. In 2012, extensive bathymetric and high-resolution seismic profiles were conducted and sediment cores were collected off the new delta lobe. This study examined delta sedimentation and morphology along a profile across the modern subaqueous Yellow River delta and into Laizhou Bay, by analyzing sediment radionuclides (¹³⁷Cs, ²¹⁰Pb and ⁷Be), sedimentary structure, grain-size composition, organic carbon content, and morphological changes between 1976 and 2012. The change in the bathymetric profile, longitudinal to the river’s course, reveals subaqueous delta progradation during this period. The subbottom boundary between the new delta lobe sediment and the older seafloor sediment (before the 1976 course shift) was identified in terms of lithology and radionuclide distributions, and recognized as a downlap surface in the seismic record. The accumulation rate of the new delta lobe sediment is estimated to be 5–18.6 cm year^–1 on the delta front slope, 2 cm year^–1 at the toe of the slope, and 1–2 cm year^–1 in the shelf areas of Laizhou Bay. Sediment facies also change offshore, from alternations of gray and brown sediment in the proximal area to gray bioturbated fine sediment in the distal area. Based on ⁷Be distribution, the shorter-term deposition rate was at least 20 cm year^–1 in the delta front.  相似文献   

舱体式防渔拖海床基的研制和应用     

魏传杰  于非  刁新源  欧江  任强 《海洋科学集刊》2016,51(51):281-287

介绍了一种新型舱体式防渔拖海床基,可布放在200m以浅海域进行长期、定点、连续、综合观测。该型海床基由坐底平台、浮体仪器舱和释放器等配件组成,可以搭载多种观测传感器进行多学科综合观测。同时,针对该型海床基设计了安全有效的布放回收方法。通过实际海上应用,结果表明舱体式防渔拖海床基具有长时间自动观测、隐蔽性好及有效防渔拖等优点,可实现对海洋环境的长期综合观测。  相似文献   

稀释技术^14C测年可靠性的研究   总被引：1，自引：0，他引：1  

业渝光  王雪娥 《海洋地质与第四纪地质》1992,12(2):99-102

稀释技术~(14)C测年的关键在于本底气的稳定,稀释技术测定的最大年限取决于样品的含碳量。同一样品无机碳部分和有机碳部分的对比实验和不同测年方法的对比实验,都证明稀释技术测定的~(14)C年龄不但复现性好而且可靠。  相似文献   

晚更新世海岸风成砂ESR年龄的研究   总被引：13，自引：1，他引：13  

业渝光  高钧成 《海洋地质与第四纪地质》1993,13(3):85-90

用ESR方法测定了系统采自山东荣成成山头“柳夼红层”11个样品的沉积年龄,表明它们是晚更新世以来沉积的受东北季风控制的海岸风成砂。此外,对沉积物中石英ESR测年的基本原理,石英Ge心信号测年的可行性,采集样品时应注意的问题等也进行了较深入的讨论。  相似文献