Archive of Datasonics SIS-1000 Chirp Subbottom Data Collected During USGS Cruise SEAX 95007 New York Bight, 7-25 May, 1995

This DVD-ROM contains copies of the navigation and field chirp subbottom data collected aboard the R/V Seaward Explorer, from 7-25 May, 1995. The coverage is in the New York Bight area. This DVD-ROM (Digital Versatile Disc-Read Only Memory) has been produced in accordance with the UDF (Universal Disc Format) DVD-ROM Standard (ISO 9660 equivalent) and is therefore capable of being read on any computing platform that has appropriate DVD-ROM driver software installed. Access to the data and information contained on this DVD-ROM was developed using the HyperText Markup Language (HTML) utilized by the World Wide Web (WWW) project. Development of the DVD-ROM documentation and user interface in HTML allows a user to access the information by using a variety of WWW information browsers (i.e. NCSA Mosaic, Netscape) to facilitate browsing and locating information and data. To access the information contained on this disk with a WWW client browser, open the file 'index.htm' at the top level directory of this DVD-ROM with your selected browser. The HTML documentation is written utilizing some HTML 4.0 enhancements. The disk should be viewable by all WWW browsers but may not properly format on some older WWW browsers. Also, some links to USGS collaborators and other agencies are available on this DVD-ROM. These links are only accessible if access to the Internet is available during browsing of the DVD-ROM. The archived Chirp subbottom data are in standard Society of Exploration Geologists (SEG) SEG-Y format (Barry and others, 1975) and may be downloaded for processing with software such as Seismic Unix or SIOSEIS. The subbottom data were recorded on the ISIS data acquisition system in QMIPS format. Chirp subbottom channel extracted from raw QMIPS format sonar files and converted to 16-bit Int. SEG-Y format using the program QMIPSTOSEGY. Even though the data are in SEG-Y format, it is not the conventional time series data (e.g. voltages or pressures), but rather instantaneous amplitude or envelope detected and therefore all of the amplitudes are positive (though not simply rectified). DOS and Microsoft Windows compatible software for plotting SEG-Y files (PLOTSEIS) and viewing SEG-Y headers (DUMPSEGY) is located in the PLOTSEIS directory. Processed chirp profiles (GIF images) may be viewed on this DVD-ROM with your WWW browser. For more information on the seismic surveys see http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=1995-007-FA These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.本DVD-ROM（Digital Versatile Disc-Read Only Memory）存储了1995年5月7日至25日期间，搭载于“海洋探索者号”（R/V Seaward Explorer）科考船采集的导航与野外chirp浅地层剖面数据，覆盖区域为纽约湾海域。 本DVD-ROM遵循通用光盘格式（Universal Disc Format, UDF）DVD-ROM标准（等效于ISO 9660文件系统规范）制作，因此所有安装了适配DVD-ROM驱动软件的计算平台均可读取该光盘。 本光盘搭载的数据与信息采用万维网（World Wide Web, WWW）项目所用的超文本标记语言（HyperText Markup Language, HTML）开发。基于HTML制作的光盘文档与用户界面，支持用户通过各类万维网浏览器（如NCSA Mosaic、Netscape）浏览、检索相关信息与数据。若需通过万维网客户端浏览器访问本光盘内容，请使用所选浏览器打开光盘根目录下的'index.htm'文件。 本HTML文档采用了部分HTML 4.0增强特性，理论上所有万维网浏览器均可正常浏览，但部分老旧浏览器可能无法正确渲染格式。此外，光盘中还提供了指向美国地质调查局（USGS）合作方及其他机构的链接，仅当浏览时可访问互联网时，此类链接方可正常使用。 存档的chirp浅地层剖面数据采用标准勘探地球物理学家协会（Society of Exploration Geologists, SEG）SEG-Y格式存储（Barry等，1975），可下载后使用Seismic Unix、SIOSEIS等软件进行处理。原始浅地层剖面数据通过ISIS数据采集系统以QMIPS格式记录，我们从原始QMIPS格式声纳文件中提取chirp浅地层剖面通道，并通过QMIPSTOSEGY程序将其转换为16位整型SEG-Y格式。尽管数据采用SEG-Y格式存储，但并非常规的时间序列数据（如电压或压力数据），而是经过包络检波得到的瞬时振幅数据，因此所有振幅值均为正值（并非简单的整流处理）。PLOTSEIS目录中包含适用于DOS与微软视窗（Microsoft Windows）系统的SEG-Y文件绘图软件（PLOTSEIS）与SEG-Y头文件查看软件（DUMPSEGY）。本光盘中还提供了已处理的chirp剖面GIF图像，可通过万维网浏览器直接查看。 如需了解本次地震勘探的更多详情，请访问：http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=1995-007-FA 本数据集还可通过GeoMapApp（http://www.geomapapp.org/）与Virtual Ocean（http://www.virtualocean.org/）两款地球科学探索与可视化应用获取。