Input for Bayesloc calculations for locating the 27 February 2022 Lop Nor earthquake
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Steven J Gibbons, NGI<br> 2022-04-04 The directories contained within this tar file contain all the files needed to calculate the location estimates<br> of the 2022-02-27 Lop Nor earthquake using the Bayesloc program with various sets of<br> inputs.<br> No output is included, only the input files: bayesloc.cfg<br> arrival.dat<br> station.dat<br> origin_prior.dat<br> and any traveltime tables needed. In each directory, the Bayesloc program is run by typing bayesloc bayesloc.cfg The directories are as follows: (a) USGS_P1only_singleevent<br> The following 5 files needed to locate using only the first P arrivals<br> in the NEIC solution (see Data and resources) ak135_P1.dat arrival.dat bayesloc.cfg origin_prior.dat station.dat (b) superset_singleevent<br> The following 6 files needed to locate using a set of arrivals based upon<br> the USGS arrivals, selected arrivals from the file ISC_info_20220402.txt,<br> and manual picks made from open stations available from IRIS. ak135_P1.dat ak135_S1.dat arrival.dat bayesloc.cfg origin_prior.dat station.dat (c) 11 different directories<br> fisk_900526<br> fisk_900816<br> fisk_920521<br> fisk_920925<br> fisk_931005<br> fisk_940610<br> fisk_941007<br> fisk_950515<br> fisk_950817<br> fisk_960608<br> fisk_960729<br> <br> In each of these directories, there are the files<br> ak135_P1.dat arrival.dat bayesloc.cfg origin_prior.dat station.dat<br> needed to locate one of the 11 nuclear explosions described in Fisk (2002)<br> on an event by event basis. (d) all_events_joint_USGSonly_fixedGT This solves for the location of the 20220227 event simultaneously with the<br> locations of the 11 GT nuclear tests, using only those arrivals chosen from<br> the USGS solution for the 20220227 event<br> (i.e. the arrivals in the directory USGS_P1only_singleevent ) This directory contains five files<br> ak135_P1.dat arrival.dat bayesloc.cfg origin_prior.dat station.dat (e) all_events_joint_superset_fixedGT This solves for the location of the 20220227 event simultaneously with the<br> locations of the 11 GT nuclear tests, using the arrivals from the 20220227<br> event "superset" (i.e. the arrivals in the directory superset_singleevent ) This directory contains six files<br> ak135_P1.dat ak135_S1.dat arrival.dat bayesloc.cfg origin_prior.dat station.dat The image "locations_panel.png" contains the output from each of the Bayesloc<br> calculations in these directories, plus a few others using the same input files but with<br> changes to the origin_prior.dat files such that the GT events are not fixed to the locations<br> specified by Fisk (2002). Panel (a) displays the bulletin location estimates listed in the file<br> "ISC_info_20220402.txt" together with the GT locations of the nuclear tests provided by<br> Fisk (2002). Panel (b) displays the results from the single event location runs: i.e. the outputs<br> from all of the directories fisk_900526<br> fisk_900816<br> fisk_920521<br> fisk_920925<br> fisk_931005<br> fisk_940610<br> fisk_941007<br> fisk_950515<br> fisk_950817<br> fisk_960608<br> fisk_960729<br> superset_singleevent<br> USGS_P1only_singleevent Panel (c) displays the locations when the files in the directory<br> all_events_joint_superset_fixedGT are run but with modifications<br> to the origin_prior.dat file to remove the 1 km lateral constraint on the GT<br> events. In addition, the brown points on this map are the output from<br> the directory all_events_joint_USGSonly_fixedGT but with the origin_prior.dat<br> modified to remove the constraints of the GT events. Panel (d) displays the locations when the files in the directory<br> all_events_joint_superset_fixedGT are run as they are.<br> In addition, the brown points on this map are the output from<br> the directory all_events_joint_USGSonly_fixedGT. In panels (c) and (d) the nuclear explosion locations are only displayed<br> for the calculations in the all_events_joint_superset_fixedGT directory.<br> The locations for these events obtained in the all_events_joint_USGSonly_fixedGT<br> directory are very similar. Data and resources<br> ------------------ The Bayesloc probabilistic multiple seismic event location software was obtained from<br> https://www-gs.llnl.gov/nuclear-threat-reduction/nuclear-explosion-monitoring/bayesloc<br> (last accessed April 2022). The file ISC_info_20220402.txt is the output from a search of<br> http://www.isc.ac.uk/iscbulletin/<br> performed on April 2, 2022. (ISC, 2022) The National Earthquake Information Center earthquake report for the 27 February 2022 event is found on<br> https://earthquake.usgs.gov/earthquakes/eventpage/us6000h0k8/executive<br> (last accessed April 2022). References<br> ---------- Fisk, M. D. (2002). Accurate Locations of Nuclear Explosions at the Lop Nor Test Site Using Alignment of Seismograms and IKONOS Satellite Imagery. Bull. Seismol. Soc. Am. 92, 29112925. doi:10.1785/0120010268. International Seismological Centre (2022), On-line Bulletin, https://doi.org/10.31905/D808B830
Steven J Gibbons, NGI<br>2022年4月4日<br>本tar压缩包内的所有目录文件，均为使用Bayesloc程序计算2022年2月27日罗布泊地震定位估计值所需的全部文件，支持多组输入参数配置。<br>本数据集未包含任何输出结果，仅提供必要的输入文件：bayesloc.cfg、arrival.dat、station.dat、origin_prior.dat，以及所有所需的走时表。<br>在每个目录下，通过执行命令`bayesloc bayesloc.cfg`即可运行Bayesloc程序。<br>各目录说明如下：<br>(a) USGS_P1only_singleevent<br>该目录包含仅使用美国国家地震信息中心（National Earthquake Information Center, NEIC）解中的初至P波到时进行定位所需的5个文件：ak135_P1.dat、arrival.dat、bayesloc.cfg、origin_prior.dat、station.dat。<br>(b) superset_singleevent<br>该目录包含基于多套到时数据进行定位所需的6个文件，这些到时数据包括USGS提供的到时、从ISC_info_20220402.txt文件中筛选的到时，以及IRIS（国际地震学联合研究机构，Incorporated Research Institutions for Seismology）开放台站的人工拾取到时。所需文件为：ak135_P1.dat、ak135_S1.dat、arrival.dat、bayesloc.cfg、origin_prior.dat、station.dat。<br>(c) 共11个独立目录，分别为fisk_900526、fisk_900816、fisk_920521、fisk_920925、fisk_931005、fisk_940610、fisk_941007、fisk_950515、fisk_950817、fisk_960608、fisk_960729。<br>每个目录下均包含ak135_P1.dat、arrival.dat、bayesloc.cfg、origin_prior.dat、station.dat这5个文件，用于逐个定位Fisk(2002)中描述的11次真实震源（Ground Truth, GT）核试验事件。<br>(d) all_events_joint_USGSonly_fixedGT<br>该目录通过仅使用2022年2月27日地震USGS解中的到时数据（即USGS_P1only_singleevent目录下的到时数据），同时反演20220227地震与11次GT核试验的震源位置。该目录包含5个文件：ak135_P1.dat、arrival.dat、bayesloc.cfg、origin_prior.dat、station.dat。<br>(e) all_events_joint_superset_fixedGT<br>该目录通过使用2022年2月27日地震的「超集」到时数据（即superset_singleevent目录下的到时数据），同时反演20220227地震与11次GT核试验的震源位置。该目录包含6个文件：ak135_P1.dat、ak135_S1.dat、arrival.dat、bayesloc.cfg、origin_prior.dat、station.dat。<br><br>图片`locations_panel.png`展示了上述所有目录中Bayesloc程序的计算结果，以及另外几组使用相同输入文件但修改了origin_prior.dat文件的计算结果——修改后不再将GT事件固定为Fisk(2002)中给出的位置。<br>图(a)展示了文件`ISC_info_20220402.txt`中收录的台网定位结果，以及Fisk(2002)给出的核试验GT位置。<br>图(b)展示了单事件定位计算的结果，即以下目录的输出结果：fisk_900526、fisk_900816、fisk_920521、fisk_920925、fisk_931005、fisk_940610、fisk_941007、fisk_950515、fisk_950817、fisk_960608、fisk_960729、superset_singleevent、USGS_P1only_singleevent。<br>图(c)展示了运行all_events_joint_superset_fixedGT目录下的文件，但修改origin_prior.dat文件以移除对GT事件的1km横向约束后的定位结果。此外，该图中的棕色点为运行all_events_joint_USGSonly_fixedGT目录下的文件，但修改origin_prior.dat以移除GT事件约束后的输出结果。<br>图(d)展示了直接运行all_events_joint_superset_fixedGT目录下文件的定位结果。此外，该图中的棕色点为all_events_joint_USGSonly_fixedGT目录的输出结果。在图(c)和图(d)中，仅展示了all_events_joint_superset_fixedGT目录计算得到的核试验事件位置，而在all_events_joint_USGSonly_fixedGT目录中得到的同类事件位置与之极为相近。<br><br>数据与资源<br>------------------<br>Bayesloc概率性多地震事件定位软件获取自：https://www-gs.llnl.gov/nuclear-threat-reduction/nuclear-explosion-monitoring/bayesloc（最后访问时间：2022年4月）。<br>文件`ISC_info_20220402.txt`为2022年4月2日对http://www.isc.ac.uk/iscbulletin/ 进行检索得到的结果（国际地震中心，2022）。<br>2022年2月27日地震的NEIC报告可从以下链接获取：https://earthquake.usgs.gov/earthquakes/eventpage/us6000h0k8/executive（最后访问时间：2022年4月）。<br><br>参考文献<br>----------<br>Fisk, M. D. (2002). 利用地震图对齐与IKONOS卫星影像确定罗布泊试验场核试验的精确位置. 美国地震学会公报(Bulletin of the Seismological Society of America), 92, 2911–2925. doi:10.1785/0120010268.<br>国际地震中心(2022). 在线台网公报. https://doi.org/10.31905/D808B830
