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Greetings tooters!

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

His main education/outreach effort is voluntarily writing up posts on These are for and events of interest, sorted in different ways; sorted by year here:

they are an engineering geologist (PG license 9758) who serves the public while at the California Geological Survey, Seismic Hazards and Tsunami programs.

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.

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.

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

for in 2018 M 7.5 offshore of

maybe related to 8/29/18 M7.1
extensional (normal) "outer rise" type earthquake
triggered M6.6 earthquake
generated modest tsunami

read report:

well, all day i have had it in my mind that the mag was M 7.4 and that is what i wrote for the ground failure and intensity interpreti e posters.

they are updated online and here is a tweet showing them.

here is the :

for M 7.4 offshore of

compressional (thrust) earthquake
generated tsunami
@USGS_Quakes models suggest high chance for liquefaction
triggered slip near interface (?)

report here:

for M7.6 offshore of the

generated ~10cm amplitude (20cm wave height) tsunami at Davao Tide Gage (which is in a somewhat sheltered location compared to epicenter so probably larger tsunami along coast)

for M7.6 offshore of

High intensity, hopefully not much suffering
Reported intensity MMI 10
Probably will generate tsunami

2018 report has tectonic background information

for in 2017 M 6.1 in

felt reports of shaking intensity up to MMI 7

learn about the regional and local tectonics in the report:

for in 2018 M7.0 in

intraslab (within the subducted Pacific plate) normal (extensional) earthquake

generated ground failures (landslides and liquefaction)

felt widely

also, see new map showing historical eqs

read report:

Updated neotectonic map of the Cascadia margin is released!

faults, folds, and other tectonic features are mapped relative to the age of their most recent activity

for in 2018 M6.3 in

strike-slip earthquake related to the Zagros fold and thrust belt

read report here

for in 2022 M6.1 in

right-lateral strike-slip fault earthquake
along the North Anatolia fault which dominates seismic hazard in N Turkey
@USGS_Quakes landslide & liquefaction models

read report

for in 2016 M6.9 offshore of

extensional (normal) faulting earthquake
possibly considered an "outer rise" earthquake (depending on location?)
generated small

read report here

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