Jason R. Patton @earthjay@qoto.org

#EarthquakeReport for M 7.5 #Earthquake offshore of #Japan

Felt intensity MMI 6
@USGS_Quakes one pager suggest low casualties and modest damage

2018 report has tectonic background https://earthjay.com/?p=7719

https://earthquake.usgs.gov/earthquakes/eventpage/us6000m0xl/executive

#EarthquakeReport 2023 Annual Summary

This is a map showing '23 #Earthquakes with Earthquake Reports

read annual review here:
https://earthjay.com/?page_id=11680

#EarthquakeReport 2023 Annual Summary

This is a plot showing cumulative energy release for '17-'23 #Earthquakes magnitude M>6.5
'23 released slightly more energy than '22
largest magnitude M 7.8 in #Turkiye

read annual review here:
https://earthjay.com/?page_id=11680

#EarthquakeReport 2023 Annual Summary

This is a table for '23 #Earthquakes magnitude M>6.5

read annual review here:
https://earthjay.com/?page_id=11680

#EarthquakeReport for #OTD in 2020 M 6.4 #Earthquake in #Croatia

right-lateral strike-slip earthquake
largest magnitude earthquake recorded on modern instruments in Croatia
@USGS_Quakes models show high chance for landslides/liquefaction

read report here
https://earthjay.com/?p=9667

#EarthquakeReport for M6.3 #Gempa #Earthquake in #PapuaNewGuinea

Compressional (reverse) earthquake mechanism
@USGS_Quakes model shows chance for earthquake induced liquefaction

Read earlier report for tectonic background https://earthjay.com/?p=7193

https://earthquake.usgs.gov/earthquakes/eventpage/at00s6hpbe/executive

#EarthquakeReport for #OTD in 2018 M 7.0 #Lindol #Earthquake offshore of the #Philippines

possibly along megathrust subduction zone fault but maybe intraplate within Philippine Sea plate
historical analogues
generated a #Tsunami

read report here
https://earthjay.com/?p=8086

#EarthquakeReport for #OTD in 2016 a pair of M5.6 #Earthquakes in #Nevada

along the Walker Lane in the region of the Mina deflection

read report:
https://earthjay.com/?p=4689

#EarthquakeReport #TsunamiReport for #OTD in 2004 M 9.15 ##Gempa #Earthquake offshore of #Sumatra #Indonesia

led to almost 1/4 million fatalities, most from the #Tsunami
we learned much from this so we can prevent future suffering

read 2017 report here:
https://earthjay.com/?p=4674

Foreshortened mother
Chillin with forethickened daughter

#EarthquakeReport #TsunamiReport for #OTD in 2016 M 7.9 #Earthquke offshore of #Bougainville & #NewIreland #PapuaNewGuinea

generated local #Tsunami
felt intensity MMI 9

learn more about regional tectonics:
https://earthjay.com/?p=4596

#EarthquakeReport for #OTD in 2017 M 6.5 #Gempa #Earthquake offshore of #Java #Indonesia

strike-slip earthquake in subducting Australia plate

read report here
https://earthjay.com/?p=6602

As I was jumping into my shower last night, I reflected upon an AGU mtg while a student

All week I slept in my truck bed, under a tarp, at the parking structure just north of the moscone center...

#EarthquakeReport for #OTD in 2017 M 4.3 #Earthquake in northern #California

seismicity between main fault strands (San Andreas and Maacama) of the Pacific/North America plate boundary

learn about the San Andreas fault system in report:
https://earthjay.com/?p=6593

@berndandeweg @judithgeology

thank you!

this paper does not have any information that helps us understand if there is a single megathrust (possibly shallower than slab 2.0), multiple slabs (like possibly in southern Cascadia), or splay faults.

are there any more recent papers with more detailed information about the fault geometry here?

got my poster done #WorkInProgress Quaternary Stratigraphy of Eel River

presenting this on Friday at #AGU23 #AGU2023 @theAGU

i posted it online here (to download or view the high resolution version, which may be updated slightly before it gets printed): https://earthjay.com/?page_id=802

#EarthquakeReport for #OTD in 2017 M 6.4 and 6.3 #Earthquakes offshore of #YapIsland #Micronesia

interesting strike-slip earthquakes within Caroline plate, possibly right-lateral (?), along the Caroline Ridge

learn about the fascinating tectonics here:
https://earthjay.com/?p=5997

@judithgeology @berndandeweg

agreed, not sure there is a double zone in the philippines (unclear, but may not be able to tell given paucity of seismometers and uncertain depths? compared to Japan, which has an abundance of seismometers).

while the megathrust in the Philippines could be shallower than slab 2.0 (seems reasonable! if not probable) alternate hypotheses include: there could be two splays of the megathrust (as appears to exist in southern cascadia: Smith et al., 1993 JGR v. 98 no. B5, p. 8153-8171)) or a splay fault responsible for the Philippine event (?).

most of the events after the mainshock were deeper. so, maybe the mainshock was on this shallower fault, which triggered slip on the deeper fault. (?)

#EarthquakeReport for #OTD in 2018 M 6.5 #Earthquake offshore of northern #California

right-lateral strike-slip earthquake on Mendocino fault
felt by yours truly onshore

learn about the Mendocino triple junction:
https://earthjay.com/?p=4567
w/report update
https://earthjay.com/?p=4571

#EarthquakeReport #TsunamiReport for #OTD in 2016 M 7.8 #Earthquake in the #SolomonIslands

probably subduction megathrust interface event
tsunami plots from Stuart Weinstein

read report
https://earthjay.com/?p=4580