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A shockwave flash movie file (FirstMo.swf) monitors first-arrival data stored in external files, supporting XML-tagged arrival directions or stereographic-projection inputs imported as JPEG. User-controlled variables include nodal plane orientations, moment magnitude scaling, transparency, and background maps. Focal depths are color-coded via a standard UGSG lookup table.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/a-focal-mechanism-diagram-generator-for-analysis-of-earthquake-first-motions/657847/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/a-focal-mechanism-diagram-generator-for-analysis-of-earthquake-first-motions/657847.png","ImageObject",300,407,{"name":92,"@type":93},"Oliver","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-26",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How does the system process earthquake first-arrival data?","Question",{"text":112,"@type":113},"It monitors first-arrival data through FirstMo.swf and accepts either XML-tagged arrival directions or stereographic-projection data imported as JPEG images.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What parameters can users adjust when generating focal mechanism diagrams?",{"text":117,"@type":113},"Users can control nodal plane orientations, moment magnitude scale, transparency, and the background map used in the visualization.",{"name":119,"@type":110,"acceptedAnswer":120},"Why are rapid, graphic focal mechanism diagrams important for public safety?",{"text":121,"@type":113},"Tsunamigenic earthquakes exhibit characteristic moment tensor solutions, so faster rendering and clearer visualization can help disseminate critical information to public safety personnel and the general public.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},657847,1792991998,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":52,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":143},8796095461610,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Journal of the Virtual Explorer, 2006 Volume 21  \nPaper 2  \n[http://virtualexplorer.com.au/](http://virtualexplorer.com.au/)  \nA Focal Mechanism Diagram Generator for Analysis of Earthquake First Motions  \nDeclan G. De Paor  \nDepartment of Physics, Worcester Polytechnic Institute, Worcester MA 01609  \n[Email: declan@wpi.edu](Email: declan@wpi.edu)  \nElizabeth Wilson  \nDepartment of Earth Sciences, Boston University, Boston MA 02215  \nHeather Melanson  \nDepartment of Earth Sciences, Boston University, Boston MA 02215  \nKeywords: XML, geophysics, earthquakes, focal mechanism, first motion, moment tensor solution, geophysical beach  \nball, visualization, Flash™, ActionScript™  \nA Focal Mechanism Diagram Generator for Analysis of Earthquake First Motions Page 1  \nAbstract: We present an interactive method for analyzing earthquake first motions and generating focal mechanism diagrams using Flash Actionscript™ . A shockwave flash movie file call FirstMo.swf monitors first arrival data stored in an external data file. Data maybe in the form of XML-tagged arrival directions (plunge, trend, and up/down ground motion), or the data may be plotted on a stereographic projection and imported as a jpeg image. Variables under user control include nodal plane orientations, moment magnitude scale, transparency, and background map. Focal depths are color-coded using a standard UGSG look-up table.  \nTsunamigenic earthquakes have characteristic moment tensor solutions, thus rapid rendering and enhanced visualization of focal mechanism diagrams may help with the dissemination of critical information to public safety personnel and the general public.  \nA Focal Mechanism Diagram Generator for Analysis of Earthquake First Motions Page 2  \nTable of Contents  \nIntroduction ............................................................................................................................. 4  \nBackground ............................................................................................................................. 5  \nData Format ............................................................................................................................ 6  \nFitting the Focal Mechanism to the data .................................................................................... 8  \nExporting Data ........................................................................................................................ 8  \nConclusions ............................................................................................................................. 9  \nReferences .............................................................................................................................. 9  \nA Focal Mechanism Diagram Generator for Analysis of Earthquake First Motions Page 3  \nIntroduction  \nAs illustrated by Figure 1 , many earthquake monitoring web sites present focal mechanism data using line-printer style output reminiscent of the earliest computer graphics. Some sites – notably the USGS and General Mapping Tools – employ sophisticated graphical interfaces and advanced visualization tools, but results are usually presented as static jpeg files that are not editable or linked to the source data. A survey of web sites in Table 1 demonstrates that the presentation of focal mechanism solutions is widespread but not generally graphically sophisticated. Determination of focal mechanisms for major earthquakes and their aftershocks is critical to our understanding of neotectonics (e.g., McNutt & Sánchez, 2000, Lisa, et al. 2004) . Indeed, this may be a matter of life and death, as tsunamigenic earthquakes exhibit characteristic focal mechanisms as well as magnitudes. Rapid publication of moment tensor solutions in a graphical format that is easily understood by public safety officials and citizens is thus a priority. We therefore undertook a programming project to facilitate the construction of focal mechanism solutions (so-called","cbCairzOkVfEdUHj","https://ap.wps.com/l/cbCairzOkVfEdUHj","pdf",525349,"English","# Introduction\n# Background\n# Data Format\n# Fitting the Focal Mechanism to the data\n# Exporting Data\n# Conclusions\n# References","[{\"question\":\"How does the system process earthquake first-arrival data?\",\"answer\":\"It monitors first-arrival data through FirstMo.swf and accepts either XML-tagged arrival directions or stereographic-projection data imported as JPEG images.\"},{\"question\":\"What parameters can users adjust when generating focal mechanism diagrams?\",\"answer\":\"Users can control nodal plane orientations, moment magnitude scale, transparency, and the background map used in the visualization.\"},{\"question\":\"Why are rapid, graphic focal mechanism diagrams important for public safety?\",\"answer\":\"Tsunamigenic earthquakes exhibit characteristic moment tensor solutions, so faster rendering and clearer visualization can help disseminate critical information to public safety personnel and the general public.\"}]","A Focal Mechanism Diagram Generator for Analysis of Earthquake First Motions | PDF",25]