[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-657849-105":59,"doc-detail-657849-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","earthquake-focal-mechanisms-analysis-and-interpretation","Earthquake Focal Mechanisms - Analysis and Interpretation","","This document provides a comprehensive overview of earthquake focal mechanisms, commonly referred to as beachball diagrams or fault plane solutions. It details the methodologies used to reconstruct fault geometry and mechanisms, primarily through the stereographic projection of waveform data. The text explains the fundamental concepts of first-motion analysis, including the use of stereonets for plotting planes, lines, and slip directions. Furthermore, it clarifies essential geological terminology such as hanging wall, footwall, and slip angle measurements, offering a clear guide to understanding seismic source processes and energy polarity within the context of fault dynamics as presented by the USGS.",{"@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/earthquake-focal-mechanisms-analysis-and-interpretation/657849/",{"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/earthquake-focal-mechanisms-analysis-and-interpretation/657849.png","ImageObject",300,407,{"name":92,"@type":93},"Hazel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-26",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What are focal mechanism solutions?","Question",{"text":112,"@type":113},"Focal mechanism solutions, also known as beachball diagrams or fault plane solutions, are simple diagrams that depict the geometry and mechanism of a fault during an earthquake.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What is the primary method used to represent fault geometry in this context?",{"text":117,"@type":113},"The primary method used is the stereographic projection, which projects half a sphere onto a flat circular plane to accurately represent planes and lines in three-dimensional space.",{"name":119,"@type":110,"acceptedAnswer":120},"How is a stereonet utilized in earthquake analysis?",{"text":121,"@type":113},"A stereonet is a template used to plot geological data, such as the orientation of fault planes, ray paths, and the rake or slip direction of a line on a fault.","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},657849,1793107847,{"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":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},137441390410,"https://ap-avatar.wpscdn.com/avatar/2000252f4ab5702993?_k=1776741390130283984","# Earthquake Focal Mechanisms\n\n# Focal Mechanism Solutions\n\nAlso called “beachball diagrams”“fault plane  \nsolutions”  \n■ Tell us the geometry and mechanism of thefault in a simple diagram  \nGenerally reconstructed from waveform dataderived from the moment tensor (which ismore general),but originally calculated usingfirst motions-done here to illustrate theconcepts  \n## Examples\n\nStrike-Slip Fault  \nNormal Fault  \nReverse Fault  \n# Two steps to understanding\n\n1)The stereographic projection  \n2)The geometry of first motions and how this isused to define fault motion.  \nscience for a changinttp://www.uwsp.edu/geo/projects/geoweb/participants/dutch/STRUCTGE/sphproj.htm  \n# Stereographic projection\n\n■A method of projectinghalf a sphere onto a circle.  \ne.g.planes cuttingvertically through thesphere plot as straight  \nlines  \nhalf of the sphere  \nhorizontal plane  \n## Stereonets\n\nA template  \ncalled a  \nstereonet  \nis used to  \nplot data.  \n■Example-  \nplotting  \nplanes  \n(e.g.faults)  \nZUSGS  \nscience for a changing world  \nStereonets  \nExample-plottinglines(e.g.ray paths)  \nZUSGS  \nscience for a changing world  \nUSGS  \nStereonets  \nExample-pitch (or  \nrake)of a lineon a plane(e.g.the slipdirection on afault)  \nZUSGS  \nscience for a changing world  \n109°  \n109°  \n# Refresher on terminology\n\nHanging wall  \nPostitive slip  \nFootwall  \nSlip angle is measured from horizontal(positive for thrusts)  \nZUSGS  \nscience for a changing world  \nUSGS  \n# Energy and Polarity of“First Motions”","cbCaivGpOo2GUEvf","https://ap.wps.com/l/cbCaivGpOo2GUEvf","pdf",1492558,29,"English","# Earthquake Focal Mechanisms\n## Focal Mechanism Solutions\n## Two steps to understanding\n## Stereographic projection\n## Stereonets\n## Refresher on terminology\n## Energy and Polarity of First Motions","[{\"question\":\"What are focal mechanism solutions?\",\"answer\":\"Focal mechanism solutions, also known as beachball diagrams or fault plane solutions, are simple diagrams that depict the geometry and mechanism of a fault during an earthquake.\"},{\"question\":\"What is the primary method used to represent fault geometry in this context?\",\"answer\":\"The primary method used is the stereographic projection, which projects half a sphere onto a flat circular plane to accurately represent planes and lines in three-dimensional space.\"},{\"question\":\"How is a stereonet utilized in earthquake analysis?\",\"answer\":\"A stereonet is a template used to plot geological data, such as the orientation of fault planes, ray paths, and the rake or slip direction of a line on a fault.\"}]","Earthquake Focal Mechanisms - Analysis and Interpretation | PDF",1792992004,73]