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.
#EarthquakeReport for M 6.5 #Earthquake offshore of #HaidaGwaii #Canada
Strike-slip earthquake mechanism
Felt onshore shaking intensity MMI 5
Tectonic setting in '18 report https://earthjay.com/?p=7888
https://earthquake.usgs.gov/earthquakes/eventpage/us7000ne51/executive
#EarthquakeReport for M4.7 #Earthquake near #Malibu southern #California
left-lateral (?) strike-slip earthquake mechanism
widely felt with reported shaking intensity MMI 5 (so far)
https://earthquake.usgs.gov/earthquakes/eventpage/ci40731623/executive
tectonic background in 2018 report https://earthjay.com/?p=7311
#EarthquakeReport for M7.0 #Earthquake offshore of #Kamchatka #Russia
@USGS_Quakes models show chance for triggered landslides and induced liquefaction
comparison between modeled shaking intensity and observations of intensity
report here:
https://earthjay.com/?p=12053
#EarthquakeReport for the M7.1 #Earthquake and #Tsunami offshore of #Kyushu #Japan
compressional earthquake mechanism
interface earthquake along the megathrust subduction zone fault
generated local tsunami
Japan issued megaquake advisory
read report here https://earthjay.com/?p=12016
#EarthquakeReport #TsunamiReport for M 7.1 #Earthquake offshore of #Japan
megathrust subduction zone earthquake
generated local #Tsunami up to about 40 cm in amplitude
these are three tide gage plots
https://earthquake.usgs.gov/earthquakes/eventpage/us6000nith/executive
#EarthquakeReport for M 5.2 #Earthquake south of #Bakersfield #California
reverse/thrust mechanism (compressional earthquake)
high acceleration (31% g recorded ~8km to the south of the epicenter)
https://earthquake.usgs.gov/earthquakes/eventpage/ci40865184/moment-tensor
tectonic setting in 2016 report https://earthjay.com/?p=3758
#EarthquakeReport for the 11 July '23 M 7.1 and 2 August '24 M 6.8 #Lindol and #Earthquake
M 7.1: extensional (normal) mechanism, deep, intraplate (slab)
M 6.8: compressional (reverse) mechanism, not deep, interface or intraplate (crustal)
report here:https://earthjay.com/?p=11987
#EarthquakeReport for M 6.8 #Gempa #Earthquake offshore of #Mindanao #Philippines
reverse mechanism (compressional) related to the subduction zone (convergent plate boundary)
https://earthquake.usgs.gov/earthquakes/eventpage/us6000nhqc/executive
read more in report from the mainshock: https://earthjay.com/?p=11611
Earlier today, a M6.8 earthquake struck the Philippines, just offshore Mindanao. This represents the 2nd largest aftershock of a M7.6 last December.
Delayed large aftershocks like this are not common, but they are always possible.
Read more on our blog: https://earthquakeinsights.substack.com/p/m68-earthquake-offshore-mindanao
#EarthquakeReport for M6.8 #Gempa #Earthquake in the #Philippines
mechanism & depth suggest to be on megathrust subduction zone (?)
@USGS_Quakes
model suggests chance for #Liquefaction
https://earthquake.usgs.gov/earthquakes/eventpage/us6000nhqc/executive
in region of M 7.6 in December '23: https://earthjay.com/?p=11611
#EarthquakeReport for M6.8 #Gempa #Earthquake in the #Philippines
mechanism & depth suggest to be on megathrust subduction zone (?)
possible local #Tsunami (?)
https://earthquake.usgs.gov/earthquakes/eventpage/us6000nhqc/executive
in region of M 7.6 in December '23: https://earthjay.com/?p=11611
#EarthquakeReport for M 4.9 #Earthquake near #Barstow southern #California
Upon further reflection, appears to be left-lateral earthquake sequence
possibly related to the Manix fault (?)
report here: https://earthjay.com/?p=11968
#EarthquakeReport for the M 4.9 #Earthquake east of #Barstow southern #California
looks like a right-lateral strike-slip earthquake mechanism (near the Calico fault)
https://earthquake.usgs.gov/earthquakes/eventpage/ci40675215/executive
learn about the tectonics of southern California in '20 report https://earthjay.com/?p=9580
#EarthquakeReport for M6.2 #Sismo #Terremoto #Earthquake en #Guatemala
Intermediate depth
Tectonic background in 2019 report from analogous event
https://earthjay.com/?p=8307
https://earthquake.usgs.gov/earthquakes/eventpage/us7000n0ka/executive
#EarthquakeReport for M7.4 #Sismo #Terremoto #Earthquake en #Chile y #Bolivia
intermediate depth
normal (extensional) mechanism
within subducted Nazca plate (slab event)
report: https://earthjay.com/?p=11955
#EarthquakeReport for M7.3 #Sismo #Terremoto #Earthquake en #Chile #Bolivia
this shows the @USGS_Quakes estimate of fatalities & damage
hopefully not too many fatalities!
learn more about regional tectonics: https://earthjay.com/?p=8588
https://earthquake.usgs.gov/earthquakes/eventpage/us7000n05d/executive
#EarthquakeReport for M7.3 #Sismo #Terremoto #Earthquake en #Chile #Bolivia
intermediate depth
normal (extensional) mechanism
"slab" event within subducted Nazca plate
chance for liquefaction
learn more about regional tectonics: https://earthjay.com/?p=8588
https://earthquake.usgs.gov/earthquakes/eventpage/us7000n05d/executive
Very pleased to have been involved in this study, published today in a First Release version, which shows that the earliest large Antarctic Ice Sheet that developed about 33.7 million years ago did not extend to West Antarctica.
1/9
https://www.science.org/doi/10.1126/science.adj3931
Explainer article about new paper about the dawn of Antarctic ice sheets. First Release version of paper published today in Science.
https://www.bas.ac.uk/media-post/the-dawn-of-the-antarctic-ice-sheets/
#EarthquakeReport for M5.7 #Earthquake offshore #VancouverIsland #Canada
Probably strike-slip (?) Maybe normal (extensional) (?)
Sequence of earthquakes where these are common
Learn more from 2018 report:
https://earthjay.com/?p=7888
https://earthquake.usgs.gov/earthquakes/eventpage/us7000mx3m/executive
lover of mud, sand, gravel, chocolate and Earthquake Reports at https://earthjay.com