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for M 7.3 near Tonga Trench

Here are the plots for gages that the PTWC listed as having waves

Pago Pago record is clear, Nukualofa record is more noisy (is it a tsunami?).

Note the difference in scale on tsunami size axis (on the right)

updated these to the report

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for M 7.3 Tonga trench

I missed this since the gage is on the nodal plane for the earthquake. BUT there was a recorded on the Pago Pago tide gage.

Here is a screenshot

report here:

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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:

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)

learn more abt regional tectonics here

for in 2018 M 6.7 earthquake

along the Jan Mayen transform fault offshore of and

along the Mid Atlantic Ridge plate boundary between the North America plate and the Eurasia plate

left-lateral strike-slip mechanism

learn more about the regional tectonics here

for the M 7.6 (likely) subduction zone in on 19 Sept 2022

catching up on reports that happened after my website went down

generated 0.6-1.7m wave height
probably triggered landslides/induced liquefaction

report (and higher resolution figures) here:

for M 6.9 in Taiwan on 18 September 2022

there was lots of damage and some casualties :-(

landslides and liquefaction models show that there was a high likelihood for these.

damage information

i am filling in some as I just got my website back up and running after almost two months of arduous work (steep learning curve getting web services set up on a robust server)

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 M 6.0 in northeast Pacific

unclear about how this relates to the Murray fracture zone

the tectonics south of the MFZ are complicated

see the magnetic anomaly maps

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