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A M7.4 earthquake offshore northern Japan today led to a megaquake advisory: a warning that the risk of a M8+ earthquake is ten times higher than usual. What does that mean, and how does this event fit into the mosaic of earthquakes in this seismically active region?
Raspishake seismometer signal after the m7.4 Japan earthquake
Strong #earthquake with a magnitude of M7.4 off east coast of Honshu, Japan, a few minutes ago. Here's the seismic signal of my Raspishake seismometer 12 mins after origin time in Herne, Germany, which is 9000 km away from the epicenter. 🧪⚒️ #geology @raspishake.bsky.social
A M7.4 struck a few hours ago the coast of #Japan at 35 km depth according to the USGS. The #tsunami alert was issued but now it’s cancelled.
At the moment, I don’t have info about the damage caused to the buildings because of the #earthquake.
#Japanearthquake
Map showing the earthquake of 2026-04-20 in Off East Coast of Honshu, Japan
Magnitude : 7.4
Region: *Off East Coast of Honshu, Japan*
Time: 2026-04-20 07:52:59 UTC
Epicenter : 143.00°E 39.87°N
Depth: 29 km
geofon.gfz.de/eqexplorer/events/gfz202...
#GEOFON #GFZ #earthquake #magnitude
A M5.7 earthquake occurred in west-central Nevada yesterday evening - close to a very similar earthquake about one year earlier. Can we tell what faults they occurred on, and were they related?
earthquakeinsights.substack.com/p/m57-earthq...
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Map showing the earthquake of 2026-04-01 in Northern Molucca Sea
Magnitude : 7.4
Region: *Northern Molucca Sea*
Time: 2026-04-01 22:48:13 UTC
Epicenter : 126.29°E 1.25°N
Depth: 34 km
*First posted at: 22:54 UTC*
geofon.gfz.de/eqexplorer/events/gfz202...
#GEOFON #GFZ #earthquake #magnitude
Updated to a M7.4.
Remember, there’s a trade-off between speed and accuracy so it’s normal for the magnitude to change as more data becomes available.
Map showing location of earthquake in the Molucca Sea
M 7.8 earthquake 119 km WNW of Ternate, Indonesia
earthquake.usgs.gov/earthquakes/...
#EarthquakeReport for M 7.4 #Gempa #Lindol #Earthquake offshore #Indonesia in Molluca Strait
Thrust/Reverse (compressional) earthquake mechanism
Possible local tsunami
Bivergent subduction zones here
Similar earthquake in 2019 earthjay.com?p=9106
earthquake.usgs.gov/earthquakes/...
#EarthquakeReport #TsunamiReport for M 7.4 #Gempa #Lindol #Earthquake offshore of #Indonesia in the Molluca Strait
Strong shaking observed
#Tsunami observed >1 meter in amplitude
Hopefully no casualties
Analogy 2019 earthquake earthjay.com?p=9106
earthquake.usgs.gov/earthquakes/...
⚒️ 🧪 A M6.5 earthquake occurred offshore Honshu, Japan today. With 3 large earthquakes in 6 months, residents may be used to shaking by now. This latest quake occurred near a M6.8 in November. But with some complicated seismic behavior, it isn’t 100% obvious that this is an aftershock.
Read more:
Today saw the largest earthquake of 2026 (so far): a M7.5 near Tonga, with moderate shaking.
Residents of Tonga were told by authorities to evacuate in case of a tsunami, even though the US Tsunami Center said it was safe. Read our post to find out why both groups might have been right.
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A M5.8 earthquake struck offshore southern Cuba last night - on the heels of a nationwide blackout. This raises memories of the 2024 M6.8 earthquake, days after a hurricane. Fortunately, this latest earthquake was not damaging, but it is reminder of the hazard of compounding disasters.
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Earlier today, a M5.3 earthquake struck northern Turkey.
The earthquake occurred on the North Anatolian Fault - a very large, very active fault with a history of many deadly M7+ earthquakes over the last century, starting in the east and moving west.
How does this event fit in?
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It’s in Spanish, but if you want the English version lemme know and I’ll sent to you. In the abstract you can read about this research.
I’m pleased to share the publication of my new research article “Consensus solution of the focal mechanism of the MW 8.8 earthquake in Kamchatka and the resulting seismic deformation fields” in ACI Avances en ciencias e ingenierías from the Universidad San Francisco de Quito. doi.org/10.18272/aci...
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A M5.3 earthquake struck western Bangladesh earlier today. The USGS estimates that more than 150 million people in this densely populated delta experienced at least intensity IV shaking. What do we know about this earthquake, and the geology that caused it?
A M7.1 earthquake struck below northern Borneo today - a large event, but because it occurred 620 km deep, not damaging. The event raises questions: how can an earthquake occur so deep, where the rocks are hot and squishy? And why here, so far from Southeast Asia’s many subduction zones? ⚒️ 🧪
A M6.2 earthquake rattled Chile yesterday, apparently a delayed aftershock of the 2015 M8.3 Illapel earthquake. (Yes, aftershocks can continue for a decade or more!) In the meantime, Chile deployed a cutting-edge offshore fiber-optic system to monitor seismicity, which recorded this event! ⚒️ 🧪
8 February 1843 14:40 UT
Mw8.5 earthquake, biggest known in Lesser Antilles, hit Guadeloupe, killing 1500-5000 people, four years after the M8 Martinique EQ. Felt as far as New York.
doi.org/10.1029/2011...
doi.org/10.1002/jgrb...
gallica.bnf.fr
chroniclingamerica.loc.gov
Wang, X., Huang, W., Fu, Q. et al. A new early permian fruit, Dengfengfructus maxima gen. et sp. nov., supports the pre-cretaceous origin of angiosperms. BMC Ecol Evo 26, 17 (2026). doi.org/10.1186/s128...
Let’s make these papers join a few relevant Bluesky feeds! 👇🏻
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#PaleoSky
Featuring a paleo-🌊 paper (Caley et al., 2026):
doi.org/10.5194/cp-2...
This swarm in San Ramon revived yesterday, with a new burst that included a M4.2. We wrote an update, and removed the paywall from our previous post to allow broader access.
If you read our posts, please consider supporting our work by becoming a paid subscriber.
⚒️ 🧪 A swarm of earthquakes has been rattling western Mindanao, the Philippines' 2nd-largest island. Some areas have been preemptively evacuated. The fault system here has a record of damaging, tsunamigenic earthquakes, and this swarm is unusual. So, what’s going on, and what can we say about hazard?
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A M5.6 earthquake in northern Pakistan caused several buildings to collapse yesterday. How does this strike-slip event fit into the menagerie of Tibetan Plateau earthquakes?
earthquakeinsights.substack.com/p/m56-earthq...
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A M5.7 earthquake in western Japan caused minor damage yesterday, preceded by very small foreshocks in the week prior. Why did it occur here, so far from the subduction zone? What do we know about the faults in this part of Japan? And is any of this related to the nearby volcanoes?
Some good news for the new year: the Museum of the Earth has avoided foreclosure and paid off its mortgage, thanks to the generosity of donors. If you helped, either by donating or raising awareness, please accept my personal gratitude. It mattered. ❤️
And if you ever visit Ithaca, stop by!
Did you ever wonder how Kyle and I ended up where we are - independently writing Earthquake Insights, rather than employed by a university? We talk about it in this interview with Shawn Willsey on his Youtube channel, Geology Explained.
www.youtube.com/watch?v=7_-G...
Presenting #YOSO, the You Only Search Once method for detecting slow earthquakes. This method creates template catalogs based on automatic detection and classification of waveforms associated with seismically slow earthquakes. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
🌟OPEN ACCESS🌟In a new #SRL paper, scientists from a working group explore applications of fiber-optic systems and consider obstacles and how to overcome them. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...