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收录了1995年5月7日至25日期间，搭载于“Seaward Explorer”号研究船（R/V Seaward Explorer）采集的导航数据与野外chirp浅地层剖面（subbottom）数据，覆盖区域为纽约湾（New York Bight）海域。
本数字多功能光盘只读存储器（Digital Versatile Disc-Read Only Memory, DVD-ROM）符合通用光盘格式（Universal Disc Format, UDF）DVD-ROM标准（等效于ISO 9660格式），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。
本光盘的数据与信息访问基于万维网（World Wide Web, WWW）项目所使用的超文本标记语言（HyperText Markup Language, HTML）开发。通过HTML编写的光盘文档与用户界面，用户可借助各类万维网浏览器（如NCSA Mosaic、Netscape）便捷地浏览、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排版。此外，本光盘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，仅当浏览光盘时可访问互联网时，这些链接方可正常使用。
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（Barry等，1975）存储，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采用ISIS数据采集系统以QMIPS格式记录。本数据集内的chirp浅地层剖面通道数据从原始QMIPS格式声纳文件中提取，并通过QMIPSTOSEGY程序转换为16位整数型SEG-Y格式。需注意：尽管该数据采用SEG-Y格式存储，但其并非常规的时间序列数据（如电压或压力信号），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目录中包含适配DOS与Microsoft Windows的SEG-Y文件绘图软件（PLOTSEIS）及SEG-Y头文件查看工具（DUMPSEGY）。用户可通过万维网浏览器浏览本光盘中已处理的chirp剖面GIF图像。
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
这些数据还可通过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程序获取。