[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-493661-105":59,"doc-detail-493661-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","glossary-seismology-and-observatory-practice-terms","Glossary - Seismology and observatory practice terms","","A glossary of seismology and observatory practice terms compiled with corrections and supplementation of multiple institutional sources. The entries define core concepts used in measuring and interpreting seismic activity, including physical parameters such as acceleration, amplitude, and anisotropy, instrumentation such as accelerometers and accelerographs, and geologic processes such as active faults, subduction-related deformation, and accretionary wedges. Additional topics include seismic-event characteristics like aftershocks, arrival and arrival time, as well as site and signal effects like amplification, arias intensity, and ground-motion implications for structures.",{"@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/glossary-seismology-and-observatory-practice-terms/493661/",{"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/glossary-seismology-and-observatory-practice-terms/493661.png","ImageObject",300,407,{"name":92,"@type":93},"Jordan Avery","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-06","2026-10-01",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the glossary cover?","Question",{"text":112,"@type":113},"It compiles definitions of frequently used terms in seismology and observatory practice, including concepts, parameters, instrumentation, and tectonic structures.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is acceleration defined in the glossary?",{"text":117,"@type":113},"Acceleration is the change in speed from one velocity to another, and during earthquakes it is the ground acceleration recorded at a station, often expressed relative to gravity (g).",{"name":119,"@type":110,"acceptedAnswer":120},"What are aftershocks according to the glossary?",{"text":121,"@type":113},"Aftershocks are smaller earthquakes that follow the largest main shock and occur within about 1–2 fault lengths from the mainshock fault, potentially continuing for weeks, months, or years.","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},493661,1790923879,{"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":29,"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},1099523882367,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Glossary  \nThe glossary of terms, which are frequently used in seismology and observatory practice, has been compiled by using, complementing and sometimes correcting glossaries published by the US Geological Survey ([http://www.usgs.gov/](http://www.usgs.gov/)), the Montana Bureau of Mines and Geology ([http://www.mbmg.mtech.edu/](http://www.mbmg.mtech.edu/)) and the International Data Center of the CTBTO ([http://www.ctbto.org](http://www.ctbto.org)). Thanks go to Christian Nerger and Johannes Schweitzer, who assisted the Editor in compiling and editing this glossary. Note that words which are written in italics in the explanatory text refer to other key words for which more explanation is given elsewhere in the glossary.  \nacceleration  \naccelerogram  \naccelerograph  \naccelerometer  \naccretionary wedge  \nactive fault  \nWhen an object, e.g., a car, changes its speed from one speed to another, it is accelerating (moving faster) or decelerating (moving slower) . This change in velocity is called acceleration. When the ground is shaking during an earthquake or another kind of seismic source process, it also experiences acceleration. The peak acceleration is the largest acceleration recorded by a particular station during an earthquake. In strong-motion seismology the ground acceleration is commonly expressed as a fraction or percentage of the acceleration due to gravity (g) where g = 981 cm/s² . For the strongest earthquakes ground accelerations of more than 1.5 g have been recorded. Since the weight of an object, e.g., of a building, is equal to its mass multiplied by the gravity g the additional acceleration due to ground shaking causes an extra load. This extra load may exceed the strength of the building and may cause damage or even a collapse.  \nThe recording of ground acceleration as a function of time during a seismic event.  \nA compact, rugged, and relatively inexpensive instrument that records the signal from an accelerometer. Film used to be the most common recording medium, modern accelerographs, however, record digitally with much larger dynamic range. A sensor whose output is almost directly proportional to ground acceleration. The conventional strong-motion accelerometer is a simple, nearly critically damped oscillator having a natural frequency of about 20 Hz.  \nSediments that accumulate and deform where oceanic and continental plates collide. These sediments are scraped off the top of the downgoing oceanic crustal plate and are added to the leading edge of the continental plate (see subduction and tectonic plate) .  \nA fault that is considered likely to undergo renewed movement within a period of concern to humans. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years, but they may also be considered active when assessing the hazard for very critical installations such as nuclear power plants even if movement has occurred in the last 500,000 years. Usually, the fault movements are (at least partially) ruptural, i.e., connected with earthquakes, however slow (creeping) movements are possible as well.  \nGlossary  \naftershocks Earthquakes that follow the largest shock of an earthquake  \nsequence. They are smaller than the mainshock and within 1-2 fault lengths distance from the mainshock fault. Aftershocks can continue over a period of weeks, months, or years, decreasing infrequency with time. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue.  \nalluvium Loose gravel, sand, silt, or clay deposited by streams after the  \nlast ice age (see holocene) .  \nAlpide belt Mountain belt with frequent earthquakes that extends from the  \nMediterranean region, eastward through Turkey, Iran and northern India.  \namplification Most earthquakes are relatively small, in fact, so small that no  \none feels them. In order for seismologists to see the recording of the ground movement from smaller earthquakes, the reco","cbCaiv18T99howbS","https://ap.wps.com/l/cbCaiv18T99howbS","pdf",173472,26,"English","# Glossary\n## Core earthquake mechanics and signals\n## Measurement parameters and intensities\n## Instruments and recording\n## Tectonics and fault concepts","[{\"question\":\"What does the glossary cover?\",\"answer\":\"It compiles definitions of frequently used terms in seismology and observatory practice, including concepts, parameters, instrumentation, and tectonic structures.\"},{\"question\":\"How is acceleration defined in the glossary?\",\"answer\":\"Acceleration is the change in speed from one velocity to another, and during earthquakes it is the ground acceleration recorded at a station, often expressed relative to gravity (g).\"},{\"question\":\"What are aftershocks according to the glossary?\",\"answer\":\"Aftershocks are smaller earthquakes that follow the largest main shock and occur within about 1–2 fault lengths from the mainshock fault, potentially continuing for weeks, months, or years.\"}]","Glossary - Seismology and observatory practice terms | PDF",1790884807,66]