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 https://cmgds.marine.usgs.gov/fan_info.php?fan=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收录了1995年5月7日至25日期间，于“Seaward Explorer”号科考船上采集的导航数据与野外chirp浅地层剖面数据副本，数据覆盖纽约湾海域。
本DVD-ROM（数字多功能光盘只读存储器，Digital Versatile Disc-Read Only Memory）遵循UDF（通用光盘格式，Universal Disc Format）DVD-ROM标准（等效于ISO 9660格式），可在安装了适配DVD-ROM驱动软件的任意计算平台上读取。
本光盘内数据与信息的访问功能依托万维网（World Wide Web, WWW）项目所用的超文本标记语言（HyperText Markup Language, HTML）开发。采用HTML构建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）便捷浏览与检索相关信息及数据。使用万维网客户端浏览器访问本光盘内容时，需通过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，所有支持万维网的浏览器均可正常查看该光盘，但部分老旧浏览器可能无法正确渲染页面格式。此外，光盘中附带指向美国地质调查局（United States Geological Survey, USGS）合作方及其他机构的链接，仅当浏览光盘时处于联网环境，这些链接方可正常访问。
归档的chirp浅地层剖面数据采用国际勘探地球物理学家学会（Society of Exploration Geologists, SEG）标准SEG-Y格式存储（Barry等，1975），可下载后使用Seismic Unix、SIOSEIS等专业软件进行处理。原始浅地层剖面数据通过ISIS数据采集系统以QMIPS格式录制。本数据集的chirp浅地层信道数据从原始QMIPS格式声纳文件中提取，并通过QMIPSTOSEGY程序转换为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）。光盘的PLOTSEIS目录中附带适配DOS（磁盘操作系统，Disk Operating System）与Microsoft Windows系统的SEG-Y文件绘图工具（PLOTSEIS）及SEG-Y头文件查看工具（DUMPSEGY）。处理完成的chirp剖面数据（GIF，图形交换格式，Graphics Interchange Format）可通过万维网浏览器在本光盘中查看。
如需了解本次地震调查的更多详情，请访问：https://cmgds.marine.usgs.gov/fan_info.php?fan=1995-007-FA
该数据集还可通过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。