Land and marine seismic profiles used to assess the seismic stratigraphy and structure of the intermediate confining unit and Floridan aquifer system, Broward County, Florida

The archived SEGY files, navigation files, and detailed metadata for these seismic reflections can also be downloaded from the National Archive of Marine Seismic Surveys (NAMSS). https://walrus.wr.usgs.gov/namss//survey/B-1-13-FL/ Marine seismic-reflection data were acquired in canals in eastern Broward County at three different times: February 2010, May-June 2011 and April-June 2013, resulting in 34 seismic reflections. During 2013, about 60 miles of high-resolution, high-frequency, marine seismic-reflection data were acquired in canals in eastern Broward County using a shallow-draft (1.5 ft) boat in water depths that ranged from about 7 to 15 ft. The data resulted in 36 new seismic profiles located along the C-9, C-11, C-13, L-35A, L-36, and North New River Canals. Data were collected at a 0.5 millisecond (ms) sampling interval with variable record lengths and a CDP bin size of 5.125 ft. A SeaMux3digital-data acquisition system, a dual air-gun source (total 20 in.3), and 72-channel hydrophone streamer with 10.253 receiver spacing was used to acquire the seismic survey. The digital sampling rate was 4 kilohertz, shot spacing about 6.25 meters m, and record length was 1.0 second. Real-time navigational positions were acquired in State Plane Florida East 0901 with a Trimble differential global positioning system (DGPS) receiver. Excel Geophysical Services performed post-acquisition processing of the seismic-reflection data. Processing steps included geometry, bandpass filtering, trace edits, noise attenuation, channel rejection, spherical divergence correction, notch filtering and odd harmonics, predictive deconvolution (2-6 ms gap), velocity analysis, normal move out correction, mute, trace balancing, stacking, and frequency-wave predictive and reject filtering. Additional processing occurred at the Department of Earth and Planetary Sciences, University of California-Santa Cruz, as part of a USGS Cooperative Ecosystem Studies Unit agreement (see Advanced Seismic Attribute Analyses section from the report SIR-XXXX, https://doi.org/10.3133/XXXXX.). Generally, the seismic records are interpretable to about 0.75 seconds two-way travel-time (TWTT) depth; one profile NNRCOM3D has an interpretable record to a depth of about 1.5 seconds TWTT. One seismic-reflection profile, about 13 miles in length, acquired along the Hillsboro Canal in 2010 for a previous Broward County study (Reese and Cunningham, 2014) and ten seismic-reflection profiles, approximately 7 miles in total length, acquired in northeastern Miami-Dade County during 2011 for seismic-reflection study by Cunningham (2015) augmented the newer inventory of 36 seismic-reflection profiles.

本数据集包含的归档SEGY格式文件、导航文件及对应地震反射的详细元数据（metadata），亦可从国家海洋地震勘测档案库（National Archive of Marine Seismic Surveys, NAMSS）下载，下载链接为：https://walrus.wr.usgs.gov/namss//survey/B-1-13-FL/

本次海洋地震反射数据采集于布劳沃德县东部的多条运河，分三次开展：2010年2月、2011年5-6月及2013年4-6月，累计获得34条地震反射剖面。2013年，研究团队使用吃水深度1.5英尺的浅吃水船只，在水深约7至15英尺的运河中采集了约60英里的高分辨率、高频海洋地震反射数据，最终沿C-9、C-11、C-13、L-35A、L-36及北新河运河获得36条全新地震剖面。

本次数据采用0.5毫秒（ms）的采样间隔，记录长度可变，共反射点（CDP）面元尺寸为5.125英尺。数据采集使用SeaMux3数字数据采集系统、双气枪震源（总容积20立方英寸）以及间距为10.253英尺的72道水听器拖缆。系统采样率为4千赫兹，炮点间距约6.25米，记录长度为1.0秒。实时导航定位采用Trimble差分全球定位系统（DGPS）接收机，坐标系为佛罗里达东州平面坐标系0901。

地震反射数据的采集后处理工作由Excel Geophysical Services完成，处理流程包括几何校正、带通滤波、道编辑、噪声压制、道剔除、球面发散校正、陷波滤波及奇次谐波抑制、预测反褶积（间隙为2-6 ms）、速度分析、正常时差校正、波形切除、道平衡、叠加以及频率-波域预测剔除滤波。后续额外处理工作由加州大学圣克鲁兹分校（University of California-Santa Cruz）地球与行星科学系完成，该工作依托美国地质调查局（USGS）合作生态研究单元协议开展（详见报告SIR-XXXX中的《高级地震属性分析》章节，链接：https://doi.org/10.3133/XXXXX.）。

一般而言，本次地震记录的可解释深度约为0.75秒双程旅行时（TWTT）；其中编号为NNRCOM3D的单条剖面可解释深度可达约1.5秒双程旅行时。2010年为布劳沃德县此前一项研究（Reese与Cunningham，2014）沿希尔斯伯勒运河采集的一条长约13英里的地震反射剖面，以及2011年坎宁安（2015）为迈阿密-戴德县东北部地震反射研究采集的总计长约7英里的10条地震反射剖面，共同补充了本次36条新地震剖面的数据集。