Anthony Lomax @ALomax@qoto.org

Okay, there appears to be a sequence of #earthquakes in #Tonga. Here is a #map of the significant earthquakes in the area in the last 30 days. The three clusters are located > 300 km apart. Source: https://earthquake.usgs.gov/earthquakes/map/?extent=-28.70959,-187.11914&extent=-12.89718,-166.02539&range=month&magnitude=significant&sort=oldest&listOnlyShown=true&settings=true 1/N

M 6.5, Fiji Islands Region
2022-11-12 07:09:14 -20.18 -178.28 595 km A
http://geofon.gfz-potsdam.de/eqinfo/event.php?from=rss&id=gfz2022webq

Today's M7.3 #earthquake near #Tonga was a different type of event, generated by compression in the outer rise due to the bending of the #subducting slab. The shallow part of the outer rise is usually experiencing tensional #stresses and produces normal faulting quakes. The deeper section is in compression, causing reverse #faulting #earthquakes, usually with low #tsunami generating potential due to their depth.

A large M=7.3 #earthquake occurred today to the west of #Tonga islands. The #focal #mechanism shows that it involved a #thrust fault (contraction). However, its location (to the east of the trench) is somehow unusual, as the #subduction dips to west. This "outer rise" region produces earthquakes related to bending/loading of the plate, but most of them have #normal (extension) focal mechanisms. Mecanism from Geoscope/IPGP.
http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000ip0l

Magnitude 7.3 #earthquake offshore Tonga 45 minutes ago (2022-11-11Z10:48) - Normal faulting. Incredible signal at station IU.CTAO (Charters Towers, Australia, available via IRIS)

https://earthquake.usgs.gov/earthquakes/eventpage/us7000ip0l/executive

See https://www.tsunami.gov/ for #tsunami information. Advisory in place

M 7.6, Tonga Islands Region
2022-11-11 10:48:44 -19.25 -172.35 15 km M
http://geofon.gfz-potsdam.de/eqinfo/event.php?from=rss&id=gfz2022wcnj

Large earthquakes in #Canada??
Not so often, but yes, some of the world’s largest #earthquakes, including:
M9 (offshore #VancouverIsland in 1700)
M8.1 and M7.8 (offshore #HaidaGwaii in 1949 and 2012, respectively).
More than 4000 earthquakes are located across Canada each year, from coast to coast to coast.

More on Canada’s earthquakes and how we minimize the impacts:
https://earthquakescanada.nrcan.gc.ca/historic-historique/GeoScienceCanada2010_Cassidyetal.pdf

https://earthquakescanada.nrcan.gc.ca/pprs-pprp/pubs/GF-GI/GEOFACT_largest-earthquakes_e.pdf

Wow. This needs to be read by everyone who joined Mastodon in the last week: https://www.hughrundle.net/home-invasion/

The largest earthquake I’ve felt was the 2016 M7.8 Kaikōura NZ. I was in Wellington and although the rupture started >200 km away, it travelled northwards towards us. The earthquake really kicked in at the top of the South Island with shaking of MMI IX (Violent), finally stopping in Cook Strait ~50 km away. More than 20 faults ruptured; the Papatea Fault displaced the coast by ~1.5 m👇 The fact that earthquakes can produce changes to our landscape in seconds is, to me, awe-inspiring and humbling.

In North America, there are numerous sites that allow us to visualise the history of #OurPlanet📜

⬇️The Goosenecks State Park in Utah provides a spectacular view of the goosenecks (or entrenched meanders) even when observed from above🌍

#EarthArt by #Copernicus #Sentinel2 🇪🇺🛰️

🐦🔗: https://nitter.eu/CopernicusEU/status/1590348216436142080

The choices facing the world at #COP27.

The planet has already warmed by around 1.2°C.

Current policies set us on track for around 3°C of warming.

Only making radically different choices will give the world a chance of not exceeding the 1.5 or 2°C limits of the Paris Agreement

M5.6 #earthquake Italy at 06.07 UTC on 9 November 2022. Recorded in Nottingham using "slinky" (top) and horizontal pendulum school seismometers
https://earthquake.usgs.gov/earthquakes/eventpage/us7000infp/executive

#IPGP #Geoscope focal mechanism for today Mw5.8 #earthquake in #CentralItaly http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000infp

Greetings tooters!

this account is for Dr. Jason "Jay" R. Patton (aka EarthJay) and I march for science. #hashtag #Introduction #MastodonIntroduction

His main education/outreach effort is voluntarily writing up #EarthquakeReport posts on earthjay.com. These are for #earthquake and #tsunami events of interest, sorted in different ways; sorted by year here: https://earthjay.com/?page_id=3220

they are an engineering geologist (PG license 9758) who serves the public while at the California Geological Survey, Seismic Hazards and Tsunami programs. https://www.conservation.ca.gov/cgs/

he has been studying the tectonics of the Cascadia subduction zone (a convergent plate boundary fault system) for over 25 years (MS thesis at cal poly humboldt, dept geology). he is an adjunct professor at this dept. https://geology.humboldt.edu/

they studied marine sedimentary records (submarine landslide deposits called turbidites) of earthquakes offshore of Sumatra/Cascadia for my marine geology & geophysics PhD at oregon state university. https://ceoas.oregonstate.edu/

capital letters are over rated but chocolate and oxford commas are not.

We are #obspy, resistance is fudel.

We make code that other people use to make code to make everybody understand this piece of rock better that we all sit on.

observations are that person that operates the seismometer their own

#introduction #python #scicomm #seismology #earthquakes #foss

Hi, a first post to introduce myself. I'm Paul Denton from the UK, I'm interested in sailing and seismology, I prefer dogs to cats.

I have spent most of my life working in Seismology, and seem to have specialised in educational seismology. I spent some time setting up and running the UK school seismology project and still have an interest in trying to create the world's cheapest functional seismic sensor using Lego.

Currently working at DentonSeismo co.uk

About a month ago, NASA's Juno probe buzzed the Jovian moon Europa, and we got this cool picture, taken from a distance of about 400 km away.

With just this picture, we can see Europa is an active world, using one of the oldest rules in the geological book. Read on to find out how!

https://www.jpl.nasa.gov/news/nasas-juno-gets-highest-resolution-close-up-of-jupiters-moon-europa