Dr. Dee Ninis

Kamchatka earthquake is among top 10 strongest ever recorded. Here’s what they have in common The earthquake in Kamchatka is the largest worldwide since 2011. Its location has been very seismically active in recent months.

New in the @aunz.theconversation.com by @deeninis.bsky.social about the large Kamchatka earthquake.

Kamchatka earthquake is among top 10 strongest ever recorded. Here’s what they have in common The earthquake in Kamchatka is the largest worldwide since 2011. Its location has been very seismically active in recent months.

My thoughts on the recent M8.8 earthquake sequence and tsunami, with my NZ colleague John Townend @vicuniwgtn.bsky.social @earthquakes.au @monashuniversity.bsky.social theconversation.com/kamchatka-ea...

Early morning NSW Hunter earthquake felt nearly 500km away in Canberra A magnitude-4.6 earthquake shakes parts of the Hunter region with impacts felt as far away as Tamworth and Canberra.

This morning, a M4.6 (prelim.) earthquake near Singleton was felt across eastern NSW.
Our latest analysis here at @earthquakes-au.bsky.social now has this as M4.9 with a depth of <4 km - comparable to the depths of earthquakes at the nearby Mt Arthur Coal Mine in 2024. www.abc.net.au/news/2025-04...

That’s a wrap for 2025 at the @seismosocam.bsky.social annual meeting. As always I am grateful for the opportunity to meet my online friends in person, and to showcase our observatory and the tools that we developed to monitor earthquakes. See you all next year in Pasadena!

How it started/ How it’s going
Water ripples
L - modern, active, beach sand;
R - ancient, preserved, sandstone

A spate of earthquakes just rattled the Asia Pacific. Should we worry? The deadly Myanmar earthquake last week was the biggest among a number of smaller quakes that rocked the region.

In the last ~2 weeks the Asia Pacific region experienced several significant earthquakes.
In addition, Japan released casualty and economic loss scenarios in the event of a local M8.0+ earthquake.
I answer a few questions in this Explainer @earthquakes-au.bsky.social
www.abc.net.au/news/2025-04...

A large olivine crystal showing bright second order interference colours. Fractures cut across the majority of the crystal, along which the olivine is being replaced by first order grey serpentine.

A relict olivine crystal being insidiously replaced by serpentine in a forsterite-diopside marble.

#thinsectionthursday #geology #science #minerals #rocks

A radar interferogram covering 17.5 to 23.5 degrees north, in Myanmar. Tightly clustered fringes delimit the likely 2025 earthquake rupture zone.

The whole #MyanmarEarthquake rupture in one interferogram! This is three consecutive wide swath frames of ALOS-2 data, provided by JAXA through agreement with NASA. The line-of-sight (LOS) is ~perpendicular to fault strike, so most of what you see is vertical motion at bends and steps of the fault.

Graph showing the possibilities of aftershocks of different magnitudes. 40% chance of M6+, 97%chance of magnitude 5+z

Aftershock foreshock for the M7.7 earthquake in Myanmar indicates a very high likelihood (97%) of earthquakes of magnitude 5+, 40% chance of M6+ and a very small possibility of another quake of M7+ (~6%) in the next week.

earthquake.usgs.gov/earthquakes/...

A M7.7 followed ~11 mins later by a M6.4 aftershock - still a strong earthquake and likely damaging in itself - in Myanmar/ Burma about 40 mins ago. It took ~12 minutes for the associated waveforms to arrive at our recorders in the @earthquakes-au.bsky.social network in southeast Australia.

From Geoscience Australia

Large earthquake south of the South Island of New Zealand. www.geonet.org.nz/earthquake/2... 🧪 Mw 6.6 with oblique-reverse faulting.

We see you, Aotearoa.
A M6.9 (prelim.) earthquake ~140 km offshore of the southernmost South Island, New Zealand, and widely felt across the South and North Islands, as detected on @earthquakes-au.bsky.social seismic network in southeast Australia.

Field work is delaying this week’s earthquake map, but while you’re waiting don’t forget to pick up your handy reference to the world’s largest earthquakes, conveniently listed on the back of this awesome Seismology t-shirt. Head to our website to buy yours now!

Here I am again. The Cheloungpu fault trench muesum, #Taiwan

They’ve arrived! Head over to www.src.com.au/product/seis... to get yours!

We’ll be giving away 100 t-shirts a day at the @seismosocam.bsky.social annual meeting next month in Baltimore, but if you’re not attending or just don’t want to miss out, you can purchase our new design MegaQuake T-shirt now through our website now - while stocks last!

What does an earthquake look like beneath your feet? This visualization shows seismic waves in action.

We’re studying how such visuals improve public communication after major earthquakes. We'd love your input! Please take our short survey & share: ww3.unipark.de/uc/SIOseismi...

Orange coloured sandstone with clear evidence of cross bedding

Ripple marks - exceptionally preserved in sandstone.

View across the kata-juta landscape

View across the landscape

Geology is absolutely beautiful.

Ripple marks, cross bedding and many more sedimentary features from a solo excursion in 2017.

Photos from kata-juta national park #Australia #geology #outback #uluru

Ever wondered what fossils palaeontologists of the future, studying the ‘Anthropocene’, will likely find? 🤔 https://www.theguardian.com/science/2025/feb/22/technofossils-how-plastic-bags-and-chicken-bones-will-become-our-eternal-legacy

Moment magnitudes and corner frequencies calculated for 437 events from the Santorini crisis (Ml>3.5, Jan 24 - Feb 13) using SourceSpec. Big thanks to the EIDA node of the National Observatory of Athens for keeping their services online during this critical period.
sourcespec.seismicsource.org

#GeoValentine! ♥️

#GeoValentine

Not gonna lie - I’m jealous of this licence plate

Magnitude 7.6 earthquake strikes offshore fault near the Cayman Islands - Temblor.net A relatively shallow, left-lateral strike-slip event struck on a fault zone that bounds the Caribbean plate.

A M7.6 earthquake struck SW of George Town, the capital of the Cayman Islands. This offshore quake occurred on a strike-slip fault. In this short news report, Temblor scientists consider which faults have been brought closer to failure.

temblor.net/temblor/magn...

Evolution of the #SantoriniAmorgos seismic sequence (#σεισμος) as it is recorded in the #SNT1 station of the Seismological Laboratory of #NKUA in Santorini's old port.

www.geophysics.geol.uoa.gr/stations/gma...

The seismic swarm northeast of Santorini, Greece, continues. Follow @eqgr.bsky.social for updates of recorded earthquakes as they happen.

An ‘earthquake swarm’ is shaking Santorini. It could persist for months

Several thousand earthquakes have been recorded near the Greek island since late January. So why is this happening?

My long-time colleague and friend Konstantinos Michailos (ANU) and I on the Anydros-Santorini earthquake swarm

@aunz.theconversation.com
@earthquakes-au.bsky.social @monashscience.bsky.social

https://theconversation.com/an-earthquake-swarm-is-shaking-santorini-it-could-persist-for-months-249278