This is an ancient beach but it’s no longer at sea level!
The red arrows show the shore platform cut by wave action into mudstone (grey); its overlain by beach sands (orange-brown) and loess (grey-brown). I studied these shore platforms, at the southern Hikurangi subduction margin in NZ, to work out how old they are; this one is ~100k yrs old but others nearby are ~125k yrs old and ~220 m in elevation! That’s an uplift rate of 1.7 mm/yr! What did this? Earthquakes! Lots and lots of #earthquakes!
New data about the growth of the #fediverse. The number of new accounts is now on average around 100k per day after the peak in November 8th of 135k new users.
Hi everyone! I am an #earthquake #geologist and #earth #scientist currently based in #Oxford, UK. I work on #activefaults, #paleoseismology, and #tectonics problems around the world, but particularly in #CentralAsia and in the western USA. I did my PhD in #Reno #Nevada and my undergraduate in #Humboldt #California.
#EarthquakeReport #EarthquakeToot for M 7.3 #Earthquake near the Tonga trench #toottoot
thrust (compressional) earthquake along the outer rise
no #Tsunami observed on tide gages
report here includes my interpretation and a regional tectonic summary:
https://earthjay.com/?p=10493
I wrote a new tutorial on how to combine iOS lidar with Structure-from-Motion photogrammetry to make accurately scaled #paleoseismic trench logs. 🚨🚨🚨 🧵
The full tutorial is available here:
https://neotectonic.github.io/posts/iOS_Surveying/
#EarthquakeReport for M 7.3 #Earthquake along outer rise near the Tonga trench
reverse (compressional) mechanism
south of analogues incl tsunamigenic 2009 M 8.1 (tho that was extensional)
https://earthquake.usgs.gov/earthquakes/eventpage/us7000ip0l/executive
learn more abt regional tectonics here
https://earthjay.com/?p=5926
@seislologist #Tooters seems a little more fun to me, though both are fun! #toottoot!
Hi fellow #Mastodonians (or is it #Tooters - I’m not sure what our collective noun is here). I try to do short weekly #earthquake #scicomm videos. This week’s deep #Fiji events were a good excuse to talk about #subduction
lover of mud, sand, gravel, chocolate and Earthquake Reports at https://earthjay.com