3-D upper crustal tomographic structure across the Vrancea seismic zone, Romania

The VRANCEA99 and VRANCEA2001 seismic refraction experiments are part of a multidisciplinary project to study the Eastern Carpathians in Romania. The objectives of these studies are intended to disclose a more detailed picture of the crustal and upper mantle structures above the seismically active Vrancea region. In this paper we provide additional constraints for the upper crustal structures of the area. The 1999 campaign consisted of a 320-km-long N–S profile and a 70-km-long E–W profile. The intersecting 2001 profile extended in E–W direction from the Hungarian border to the Black Sea. In order to enhance the model resolution, first arrival data from local crustal earthquakes were also included.This configuration allowed for the first time to derive a 3-D velocity model for the upper crust of the Romanian Carpathian Orogen, within a 115×235 km wide region, centred over the Vrancea seismic zone. The 3-D model reveals lateral velocity variations, which were not visible on the in-line interpretations. It allows us to distinguish between foreland platform areas, foreland basins and the Carpathian Orogen. Clear velocity differences between the foreland basins south and southeast of the Eastern Carpathians and the Focsani Basin further north indicate different pre-Miocene sedimentary compositions and geological evolutions of these foreland platforms. The involved Moesian and Scythian platforms are separated by the Trotus Fault system, which is observed as a velocity discontinuity. An upper crustal high-velocity zone, above the northern Vrancea seismic zone, could also be identified. This high-velocity zone is explained by a Middle Pliocene to Pleistocene E–W oriented out-of-sequence thrust of the crystalline basement, below the decollement of the flysch nappes.     

2009年3月28日山西原平4．2级地震现场考察报告

2009年3月28日19时11分,在山西省原平市苏龙口镇发生4．2级地震。地震后,由山西省地震局、忻州市地震局联合组成的现场工作队,对此次地震进行了现场考察。经调查,宏观震中位于原平市苏龙口镇下政化村代县新高乡沿村之间,截止到3月30日08时共发生余震67次,宏观震中最大烈度为Ⅴ度,地震有感范围涉及忻州市大部分地区和太原、朔州、阳泉、大同等4市的部分县区,总面积约30000m^2。     

2010年1月24日河津4．8级地震现场考察报告

2010年1月24日10时36分,在山西省河津发生4．8级地震。地震后,由山西省地震局、运城市地震局和河津市、万荣县地震局联合组成地震现场工作队进行了震情监测、科学考察、地震灾害评估等工作,经调查,宏观震中位于万荣县张家院村一带,与中国地震台网测定的微观震中相距约12km,与运城地震台网测定的微观震中相距约2km。     

中国北方寒武—奥陶系岩溶层组类型及其区域变化规律

本文在大量剖面资料统计的基础上,根据岩层的厚度比例和连续厚度及其组合形式,对我国北方寒武—奥陶系岩溶层组类型进行了划分,着重论述了岩溶层组类型的区域变化规律。为含水层系统的划分和水资源评价及区域岩溶发育规律的研究,提供了重要的基础资料。      

论江西气象信息与技术保障体系改革与建设

分别对气象信息网络系统和技术保障系统改革与建设中的主要任务、各级分工进行了论述,认为江西气象信息与技术保障体系改革与建设,应坚持综合性、先进性、可行性、开放性、集约化和标准化原则,坚持发挥国家和地方2个方面的积极性,多渠道筹集资金,统筹规划,不断强化信息与技术保障体系。     

论江西公共气象服务体系改革与建设

阐述了公共气象服务的内涵,并对江西公共气象服务体系改革与建设的思路、重点,以及服务的组织与分工进行了论述,认为江西公共气象服务体系改革与建设,应主动适应国家安全、经济社会发展和人民生活、构建和谐社会对公共气象服务的总体需求,坚持“公共气象”的发展方向,把防灾减灾服务放在公共气象服务的首位;应体现“以人为本”的理念,满足和不断适应各类用户的不同需求,以体制改革和机制创新为动力,以提高服务水平与能力为主线,积极推进气象服务现代化建设,改善服务手段,提高服务质量,实现服务产品的多样化、系列化和可视化,推动气象应急服务进农村、进企业、进社区,构建集约化、开放式的公共气象服务体系。     

论江西省气象局业务技术体制改革的总体思路及目标

阐述了新时期新阶段进行气象业务技术体制改革的重要性和必要性,并就改革的重点、总体思路和总体目标进行了论述,认为江西气象部门要在中国气象局的领导下,以“三个代表”重要思想为指导,全面贯彻落实科学发展观,按照中国气象局业务技术体制改革总体方案的要求,精心设计、全面部署,稳妥推进气象业务技术体制改革,从根本上解决制约江西气象事业快速发展的深层次矛盾和问题,促进江西气象工作更好地融入经济建设主战场,巩固和提升气象事业在江西经济社会发展中的地位和作用,实现江西气象事业又快又好地发展,为江西在中部地区崛起做出更大的贡献。     

Nonlinear Model of Mean Free Surface of Waves

-A nonlinear model of mean free surface of waves or wave set-up is presented.The model isbased on that of Roelvink(1993),but the numerical techniques used in the solution are based on theWeighted-Average Flux(WAF)method(Watson et al,1992),with Time-Operator-Splitting(TOS)usedfor the treatment of the source terms.This method allows a small number of computational points to beused,and is particularly efficient in modeling wave set-up.The short wave(or primary wave)energy equa-tion is solved by use of a more traditional Lax-Wendroff technique.A nonlinear wave theory(James,1974)is introduced.The model described in this paper is found to be satisfactory in most respects whencompared with the measurements conducted by Stive(1983)except in modeling the mean free surface veryclose to the mean shoreline.