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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!

still learning about how to run a toot thread... i wish the pasting of toots included the graphical preview from the original toot... but the ability to run a thread is more important than the thread behaving like they do on other platforms.

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.

for M 7.3 near the Tonga trench

thrust (compressional) earthquake along the outer rise

no observed on tide gages

report here includes my interpretation and a regional tectonic summary:
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:
neotectonic.github.io/posts/iO

for M 7.3 along outer rise near the Tonga trench

reverse (compressional) mechanism

south of analogues incl tsunamigenic 2009 M 8.1 (tho that was extensional)

earthquake.usgs.gov/earthquake

learn more abt regional tectonics here
earthjay.com/?p=5926

Hi fellow (or is it - I’m not sure what our collective noun is here). I try to do short weekly videos. This week’s deep events were a good excuse to talk about

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