As a further introduction, I thought it might be helpful to have a thread including the primary sources of information for earthquakes around the world & nationally. This will hopefully be useful for those interested in looking up about quakes in the future 1/n
The most often used source for earthquake information is USGS (@USGSted). They locate quakes all over the world, with a more detailed catalogue provided for the US & their associated territories (primarily Puerto Rico). Their website is here: earthquake.usgs.gov/earthquakes/ma… 2/n
To search the database for specific events click on the gear on the top right of the page, then click the button "Search Earthquake Catalog". This will redirect you to a search engine, where you can input magnitude, date & area bounds to search for specific events 3/n 
Another widely used source for quake data is EMSC (@LastQuake). They compile quake data from many agencies worldwide (not just USGS) and provide a comprehensive picture of seismicity in Europe & elsewhere. Their website can be found here: emsc-csem.org 4/n
The agency I most often use is a program run by GFZ Potsdam (@GFZ_Potsdam) called GEOFON. They use their own network of global seismograph stations to detect & locate quakes around the world. I use them for moment tensor solutions for my own catalogue: geofon.gfz-potsdam.de/eqinfo/list.php 5/n
Another project which provides near real-time data for seismicity worldwide is ALomax (@ALomaxNet). Using numerous seismograph networks, he provides very early estimates for locations & magnitudes of quakes; he often is the first to report events: alomax.free.fr/projects/early… 6/n
A smaller project, which is supported by IPGP, is the GEOSCOPE observatory (@geoscope_ipgp). They provide models for large earthquakes around the world, including moment tensors & moment release models (how the earthquake released energy over time): geoscope.ipgp.fr/index.php/en/d… 7/n
Moving onto national agencies, I must start with my own nation's agency, the British Geological Society (@BritGeoSurvey). They locate quakes around the British Isles & have been doing so for the past 40 years. Generally all quakes >M1.5 are located: earthquakes.bgs.ac.uk/earthquakes/re… … 8/n
In New Zealand the agency is called GeoNet (@geonet), a program within GNS Science (@gnsscience). They locate quakes in & around New Zealand (including the Kermadec Islands) & generally record all onshore seismicity >M2.0: geonet.org.nz/earthquake 9/n
In Japan the agency is the Japanese Meteorological Agency (JMA). The use the densest network of seismographs & accelerometers in the world to locate quakes in the main Japanese islands (Hokkaido, Honshu, Shikoku & Kyushu) & the Ryukyu Islands: jma.go.jp/en/quake/quake… 10/n
A secondary website for Japan quakes is Hi-net, part of the NIED. They provide early estimates for Japanese quakes - they also provide moment tensor solutions for Japanese quakes, generally earlier than international agencies are able to: hinet.bosai.go.jp 11/n
To continue in the Pacific, Chile is served by CSN (Centro Sismologico Nacional within the Universidad de Chile). They provide national location for quakes within Chile, but do not produce moment tensor solutions: sismologia.cl 12/n
Mexico is served by SSN (Servicio Sismologico Nacional). As with the previous agency for Chile their website is in Spanish - this shouldn't be too much of a problem for non-Spanish speakers as the Spanish words for earthquake terms are fairly obvious: ssn.unam.mx/sismicidad/ult… 13/n
Continuing in the Pacific, Taiwan is served by the CWB (Central Weather Bureau), again using a national network of seismographs to locate quakes. For the Hualien sequence earlier this year their data was incredibly useful: cwb.gov.tw/V7e/earthquake/ 14/n
A couple of countries people would not necessarily think of for quakes: Australia is served by Geoscience Australia (@GeoscienceAus). Seismicity in Australia does include some damaging & large events (the 1989 Newcastle, NSW, quake is an example): earthquakes.ga.gov.au 15/n
Canada is another country often forgotten for seismic hazard & is served by Natural Resources Canada (@NRCan). Seismicity affects the Pacific coast of the country (2012 Haida Gwaii) & also the Charlevoix Seismic Zone in the densely populated east: earthquakescanada.nrcan.gc.ca/index-en.php 16/n
Before I move onto Europe, the Philippines is another country severely affected by quakes. Their agency is PHIVOLCS (@phivolcs_dost) & they provide seismic data for the whole of the Philippines - this was useful for the 2017 Surigao quakes: phivolcs.dost.gov.ph/index.php/eart… 17/n
For Indonesia BMKG (@infoBMKG) are the agency to use. Their website is not the most user friendly & actually finding a searchable database is troublesome, especially as most of the website is in Indonesian. Nevertheless they provide good information: bmkg.go.id/gempabumi/gemp… 18/n
Two further agencies, in Asia this time: the first is the Myanmar DMH (Department of Meteology and Hydrology), who have in recent months been assisted in improving their network by USGS (in particular @SeismoSue & @GeoGinger). Their website is here: moezala.gov.mm/earthquake-new… 19/n
A final Asian agency is the IRSC (Iranian Seismological Center), run by the University of Tehran. Their website provides a comprehensive database of recent Iranian seismicity - Iran is one of the most seismically active countries in the world: irsc.ut.ac.ir/index.php?lang… 20/n
In Europe there are four major national agencies to highlight. The first is the Icelandic Met Office (@Vedurstofan) who provide fantastic data about seismicity & the volcanoes in Iceland - always worth a check if going on holiday there: en.vedur.is/earthquakes-an… 21/n
Italy is one of the two most seismically active nations in Europe & their agency is INGV (Instituto Nazionale Geofisica e Vulcanologia: @INGVterremoti). Their data was incredibly useful in following the devastating 2016 Central Italy sequence: cnt.rm.ingv.it/en/ 22/n
For Greece, the other most seismically active nation in Europe, their agency is NOA (National Observatory of Athens). Their data has been useful for many quake sequences - looking at the real-time seismicity now will show the Zakynthos sequence: bbnet.gein.noa.gr/HL/ 23/n
For Turkey the best agency is the Kandilli Observatory (@Kandilli_info) which is celebrating 150 years in 2018! When the next North Anatolian Fault quake occurs, they will be of great use to following the sequence: koeri.boun.edu.tr/scripts/lst0.a… 24/n
Finally, to wrap up this list of global & national agencies, is IGN (Instituto Geografico Nacional (@IGNSpain). Spain doesn't suffer too many quakes, but events such as Lorca in 2011 can be damaging and deadly. They also monitor the Canary Islands: ign.es/web/resources/… 25/25
