Cenozoic stratigraphy and sedimentation history of the northern Philippine Sea based on multichannel seismic reflection data

Abstract To clarify the regional distribution and characteristics of the sedimentary deposits in the northern part of the Philippine Sea, multichannel seismic reflection surveys of 26 864 km in total length were performed. The seismic reflection data were interpreted and correlated with available Deep Sea Drilling Project/Ocean Drilling Program (DSDP/ODP) data and a general stratigraphic framework of the area was established. The sedimentary deposits in this area were divided into five layers; Units I, II, III, IV and V in ascending order. Their approximate geological ages are the Early Eocene, Middle to Late Eocene, Oligocene, Miocene and Pliocene‐Pleistocene, respectively. Seismic records were classified into three seismic facies, Facies A, B and C, on the basis of their characteristics. They were judged to represent pelagic and hemipelagic sediments of non‐volcanic origin, fine pyroclastic sediments and coarse pyroclastic or volcanic sediments, respectively, by comparing them with lithological data in the DSDP/ODP holes. From the thickness and facies distributions of these sediments, a sedimentary history in the area was reconstructed as follows. The oldest sediments in the study area, Unit I, interfinger with some parts of the Daito Ridge (acoustic basement) in the Minami Daito Basin. The geological age of the unit is estimated by microfossils in the sediment and supports the idea that this part of the Daito Ridge is composed of the Early Eocene oceanic basalt. Later, a fair amount of sediments were deposited in the Minami Daito Basin in the Middle to Late Eocene age. A large volume of volcanic materials was supplied from the Paleo‐Kyushu‐Palau Ridge in the Kita Daito Basin in the Eocene and Oligocene ages. The eastern part of the Shikoku and Parece Vela basins is characterized by volcanic sediments supplied from the Nishi Shichito and West Mariana Ridges in the Miocene age. However, pelagic and hemipelagic sediments prevail in the northern part of the Shikoku Basin in the Miocene or later. In short, the area of principal sedimentation has generally shifted from west to east through geological time, reflecting the evolution of the island arc systems with the same trend in the northern Philippine Sea.     

WebGIS在地震地磁数据共享系统中的初步应用

为了实现地震地磁数据的社会资源整合和共享的目的, 利用网络、 WebGIS及数据库技术, 开发了基于网络环境的地震地磁数据共享系统; 系统实现了信息服务、 数据服务和功能服务, 改善了地震地磁数据的应用领域和应用层次。 从系统原理及功能设计、 WebGIS系统、 地震地磁数据库系统、 Web发布及数据共享子系统等几个方面阐述开发建设过程中的主要技术环节。     

基于WebGIS的强震动台网数据发布系统研究

WebGIS技术在美、日等国家强震动台网发布系统中得到了广泛应用，本文提出了我国强震动台网系统利用WebGIS发布信息的设计思路。对系统环境设计和关键技术以及空间数据库架构进行了研究，指出分布式WebGIS的应用研究已成为强震动台网数据发布系统建设的发展趋势。     

网络分布式地震数据库万维网站的地震数据服务

21世纪是信息的时代.这有两个方面,一方面是信息的产出速度越来越快,产出量越来越大,使得信息积累越来越多,因而需要有效的信息组织管理的手段.另一方面是对方便快捷地获取信息的需求越来越强烈.因特网的普及带动了大范围内进行信息共享的需求的增长,对于当今的社会生活是如此,对于科研活动尤其如此,因而需要有效的信息服务手段.     

地震数据采集器中以太网接口的实现

介绍INTEL公司生产的RISCCPU SA1110,提出了使用Cirrus Logic公司生产的单片IEEE802．3网络控制芯片CS8900来拓展地震数据采集器的网络功能,以实现系统的以太网接口。文中详细介绍了SA1110与CS8900的硬件接口设计。     

TSP-203系统数据采集的改进方案

TSP-203系统（Tunnel Seismic Prediction System）是针对复杂地质条件设置的隧道挖掘超前地质预报系统,目前广泛应用.该系统从数据采集、处理和成果评估高度智能化,采用该系统可以预报隧道工作面前方至少100m围岩地质体的性质、位置和规模,并可算出其岩石物理力学参数,为确定合理的支护参数提供依据,提高了隧道施工安全和质量.本文针对TSP-203系统的野外工程中遇到的精度和勘探成本问题,根据石油地震勘探的理论方法,考虑系统观测的激发和接收两大因素,提出系统数据采集的改进方法：1）在信号激发方面提出组和爆炸方法;2）在针对信号接受方面提出传感器新的安装改进方法.     

强地震动数据采集系统研究

本文介绍了GDQJ—1A型强地震动数据采集系统的结构原理和技术性能，它可用于强地震观测和工程振动测量。     

强地震动数据采集实时系统研究

本文介绍了GDQJ-2型强地震动数据采集实时系统的结构原理和技术性能,着重介绍了一个台网形式的数据采集实时系统数据的处理流程、系统软件的多线程处理、对串口和Modem的操纵方式、数据帧的构成和压缩方式等。该系统可用于强地震观测和工程振动测量。     

Thermochronological data from Sudan in the frame of the denudational history of the Nubian Red Sea margin

Low‐temperature thermochronology provides information on the timing of rifting and denudation of passive margins, and the Red Sea with its well‐exposed, young rift margins is a suitable setting for its application. Here we present new apatite fission‐track (AFT) data from Sudan northern hinterland and Red Sea coastal areas. From the former region we obtained ages between 270 ± 2 Ma ad 253 ± 53 Ma, and from the coastal belt between 83 ± 8 Ma and 39 ± 7 Ma. These data prompted a review and comparison with low‐temperature thermochronological data from the whole Nubian Red Sea Margin, and a discussion on their implication in assessing the margin evolutionary style. AFT data are available for Egypt and Eritrea as well as apatite (U‐Th)/He (AHe) ages for two transects transversal to the margin in Eritrea. Both in Egypt and Eritrea AFT data record a cooling event at about 20–25 Ma (Early Miocene) and an earlier, more local, cooling event in Egypt at about 34 Ma (Early Oligocene). The thermal modeling of the Sudan samples provides an indication of a rapid cooling in Miocene times, but does not support nor rules out an Early Oligocene cooling phase. The re‐assessment of new and existing thermochronological data within the known geological framework of the Nubian and conjugate Arabian margins favours the hypothesis that early rifting stages were affecting the whole Gulf of Suez–Red Sea–Gulf of Aden system since the Oligocene. These precocious, more attenuated, phases were followed by major extension in Miocene times. As to the mode of margin evolution, AFT age patterns both in Egypt and Eritrea are incompatible with a downwarp model. The distribution of AHe ages across the Eritrean coastal plain suggests that there the escarpment was evolving predominantly by plateau degradation. Copyright © 2009 John Wiley & Sons, Ltd.     

基于主从架构的可扩展地震前兆数据采集系统设计与实现

提出地震前兆数据管理系统中可扩展的分布式数据采集系统架构,该架构可以快捷地使用第三方资源对系统能力进行扩展,从而很好的应对变化的资源需求.在传统的主从模型基础上,通过创建执行器来执行任务和分配资源,可以有效执行任务.     

ARM嵌入式系统在海底大地电磁信号采集中的应用研究初探

按照现代地电探测仪器的特点和技术要求,首次将ARM嵌入式系统引入地电信号探测领域．建立了基于ARM的海底大地电磁数据采集系统．面向系统开发过程。提出ARM嵌入式系统实现的硬件和软件设计方案。初步尝试实现了地电信号数据采集仪器的低功耗、小型化和智能化。     

基于Web的地磁数据管理系统的设计

采用B／S架构,设计基于Web的地磁数据管理系统。以提高日常工作效率,改善信息环境为目标,将地磁数据由文件管理过渡到数据库管理,为地磁数据的上报、管理、应用等功能的重新整合,并向网络上迁移,提出一个系统的解决方案。同时结合工作流程再造,为本行业的信息化建设、服务水平的提高提供技术支持。     

Effects of metallic system components on marine electromagnetic loop data

Electromagnetic loop systems rely on the use of non-conductive materials near the sensor to minimize bias effects superimposed on measured data. For marine sensors, rigidity, compactness and ease of platform handling are essential. Thus, commonly a compromise between rigid, cost-effective and non-conductive materials (e.g. stainless steel versus fibreglass composites) needs to be found. For systems dedicated to controlled-source electromagnetic measurements, a spatial separation between critical system components and sensors may be feasible, whereas compact multi-sensor platforms, remotely operated vehicles and autonomous unmanned vehicles require the use of electrically conductive components near the sensor. While data analysis and geological interpretations benefit vastly from each added instrument and multidisciplinary approaches, this introduces a systematic and platform-immanent bias in the measured electromagnetic data. In this scope, we present two comparable case studies targeting loop-source electromagnetic applications in both time and frequency domains: the time-domain system trades the compact design for a clear separation of 15 m between an upper fibreglass frame, holding most critical titanium system components, and a lower frame with its coil and receivers. In case of the frequency-domain profiler, the compact and rigid design is achieved by a circular fibreglass platform, carrying the transmitting and receiving coils, as well as several titanium housings and instruments. In this study, we analyse and quantify the quasi-static influence of conductive objects on time- and frequency-domain coil systems by applying an analytically and experimentally verified 3D finite element model. Moreover, we present calibration and optimization procedures to minimize bias inherent in the measured data. The numerical experiments do not only show the significance of the bias on the inversion results, but also the efficiency of a system calibration against the analytically calculated response of a known environment. The remaining bias after calibration is a time/frequency-dependent function of seafloor conductivity, which doubles the commonly estimated noise floor from 1% to 2%, decreasing the sensitivity and resolution of the devices. By optimizing size and position of critical conductive system components (e.g. titanium housings) and/or modifying the transmitter/receiver geometry, we significantly reduce the effect of this residual bias on the inversion results as demonstrated by 3D modelling. These procedures motivate the opportunity to design dedicated, compact, low-bias platforms and provide a solution for autonomous and remotely steered designs by minimizing their effect on the sensitivity of the controlled-source electromagnetic sensor.     

GPRS强震无线数据传输系统

简单介绍了GPRS强震无线数据传输系统的研发背景,对GPRS业务做了一定的阐述,着重介绍了强震无线数据传输系统的网络结构、功能特点和系统组成。本系统在台站端采用嵌入式模块作为数据传输与控制终端,在台网数据中心采用C/C 、PHP和MySQL数据库技术组合开发,利用WindowsSockets的网络通信模式,实现客户端与服务器socket连接,建立传输控制链路。系统具有强震事件准实时传输、连续波形实时传输、事件短消息通知、反向控制与数据监视、数据管理、数据共享等功能。GPRS强震无线数据传输系统自2005年6月测试运行以来,达到了预期效果,这一系统将被应用于“十五”广东省数字强震动台网数据传输和管理。     

煤矿地震数据管理系统的开发

煤矿安全生产要求对三维地震数据进行动态解释，急需基于Windows平台并具有基本解释功能的地震数据管理系统.本文介绍了煤矿地震数据管理系统，它是以Windows 2000/XP作为平台，使用VC++7.0作为开发工具进行研制开发的.     

地电故障数据处理系统

地电故障数据处理系统软件研制的目的在于当地电仪器出现故障,无法采集到仪器内存中原始数据时,能根据地电纸带上仅有的一些原始数据,利用该系统可以准确、快速、方面地转换成特定格式的数据文件,及时上报至中国地震局。该系统的开发,将会减轻台站工作人员的负担,杜绝了数据格式的不正解性,防止了数据迟报现象的发生。     

基于实时测震数据的可视化系统的设计与实现

为研究在地震速报等基于测震数据的业务场景中,对于地震事件检测等中间处理结果的可视化问题,本文设计实现了一套基于实时测震数据的可视化系统。该系统利用分布式消息队列Kafka实现了流式数据的缓存,利用分布式实时数据处理框架Flink实现了震相到时拾取和地震事件检测,最终利用大数据可视化组件Echarts实现了基于全国范围的各个地震台站的震相到时统计情况展示地图。通过部署与应用,该系统达到了设计的目的,实现了应有的功能,满足了实际需求。      

检测算法在地震数据实时处理系统中的应用

1 概述 实时事件检测是地震数据实时处理系统中一项重要任务。无论国家数字地震台网、区域数字地震台网还是单个数字地震台站,都需要对通过传输系统接收到的地动信号进行事件检测。事件检测的目的在于从连续的地面运动信号数据流中,识别出需要处理的事件信号。事件检测的要求,一是尽可能将所有的事件识别出来,即降低漏检率;二是尽可能地     

基于系统辨识提高地震资料分辨率研究

提高地面地震资料垂向分辨率是地球物理领域研究的难点和热点.本文提出了基于系统辨识利用测井资料提高地面地震资料分辨率的新方法.通过地层对地震波吸收的线性系统假定,首先建立了地面地震信息与声波测井信息相互联系的理论模型,然后基于系统辨识技术估计地层对地震波吸收的系统特性,进而对地面地震资料进行补偿性高频恢复.对不同分辨率的正演模拟资料、实际地面地震资料的处理结果表明,该技术在保持原地震资料主要特征不变的条件下,使主频为代表的优势频带提高约10～20Hz,频带拓宽约10Hz,有效提高了地震资料的垂向分辨率.     

城市地震应急指挥技术系统数据管理研究

以城市地震应急指挥技术系统(UEECTS)数据管理为研究背景,将空间地理信息系统技术引入数据管理领域,为UEECTS系统设计并开发了数据管理子软件系统,在实现对UEECTS系统数据空间可视化展示的基础上,实现了对系统数据的查询、添加、删除及修改数据管理操作,为城市UEECTS系统建设提供了良好的数据支持。针对UEECTS系统的数据规划以及数据管理子软件系统的开发与实现做了详细讨论与阐述,以期为全国范围内UEECTS系统数据库的建设以及数据管理子软件系统的开发应用提供通用性模型。