Seismic Daylight Imaging: A New Passive-Seismic Method to Image Basin and Crustal Structure

标题：“地震日光成像：一种新的被动地震成像方法来成像盆地和地壳结构”，PI: Klemperer和Claerbout，斯坦福大学。我们正在开发一种新的被动地震成像技术，我们称之为“地震日光成像”（SDI），并将测试其在加利福尼亚旧金山湾区圣克拉拉山谷下成像盆地和地壳结构的能力。我们希望SDI可以补充更昂贵的有源地震成像（即通常是小型炸药爆炸），甚至可能在极端建筑密度和文化噪音排除传统有源方法的情况下取代有源射击。我们将生成圣克拉拉山谷下地壳结构的地震图像，类似于有源地震调查产生的图像，但分辨率较低。因此，我们将通过描绘重要的地壳结构，如地壳中部分离和沉积盆地深度，来增加对加利福尼亚中部构造的现有知识。我们还将通过约束盆地深度和速度剖面来改善圣克拉拉谷地震灾害的微区划。SDI是一个相对简单但耗时的过程。利用最近在圣克拉拉谷地震实验（SCVSE）中获得的现有数据，将整个数据集的地震迹线进行交叉相关，每次一小时，从垂直通道开始，然后堆叠。相互关联将产生一个虚拟地震记录的立方体，然后将其迁移到圣克拉拉山谷下的地壳结构的三维地震图像。我们的SDI图像将与USGS最近在同一地区进行的线性高分辨率有源地震调查进行比较。

Abstract for proposal EAR0106693 (PH # 21x)Title: "Seismic Daylight Imaging: A new passive-seismic method to image basin and crustal structure" PI's: Klemperer and Claerbout, Stanford Univ.We are developing a new passive-seismic imaging technique that we call "Seismic Daylight Imaging" (SDI), and will test its ability to image basin and crustal structure beneath the San Clara Valley in the San Francisco Bay area, California. We hope SDI can supplement more costly active-source (i.e., typically small dynamite explosions) seismic imaging, and even possibly supplant active-source shooting in cases where extreme building density and cultural noise precludes the traditional active-source methodology. We will produce a seismic image of the crustal structure beneath the Santa Clara Valley, similar to one produced by an active-source seismic survey, but with less resolution. Thus we will add to existing knowledge of central California tectonics by delineating important crustal structures such as midcrustal detachments and sedimentary basin depths. We will also improve microzonation of earthquake hazards in Santa Clara Valley by constraining basin depths and velocity profiles.SDI is a relatively simple, but time consuming process. Using existing data recently acquired in the Santa Clara Valley Seismic Experiment (SCVSE), seismic traces from the entire data set will be cross-correlated, one hour at a time, beginning with the vertical channel, and stacked. The cross-correlations will result in a cube of virtual seismic shot records, which will then be migrated to produce a 3-D seismic image of crustal structure beneath the Santa Clara Valley. Our SDI image will be compared with a linear high-resolution active-source seismic survey that has recently been conducted by the USGS in the same area.