Fumihiko Ikegami

I will talk about geology, volcanoes, and GIS.

Rice crops are harvested at the rice field where the recent Kumamoto Earthquake caused a surface rupture... Geologists are on site. More free photos in the newspaper "Mainichi" website: mainichi.jp/graphs/20261...

8th Volcano Geology International Workshop volcanogeology.iavceivolcano.org Anyone may find this interesting (I am advertising this because the leaders are my bosses and friends😃)

Now I have ICPMS in my house.

Free phone wallpaper! Thanks ESA Sentinel-2 for these beautiful imageries of Titan Ridge volcano in Bismarck Sea. Processed raw images with Adobe Lightroom Classic.

Finally, the eruption of Titan Ridge volcano in Bismarck Sea looks ending. It is emitting only a small amount of pumice. And luckily, the winds blow the pumice rafts away from the islands of Manus. The rafts are only seen in lagoons. browser.dataspace.copernicus.eu?zoom=13&lat=...

One Hunga Tonga umbrella is going to Tonga Geological Services. I believe that it is the right place to donate one.

Had some heated discussion that serpentine is whether igneous or metamorphic.

High-res footage of the Titan Ridge volcano eruption at the Bismarck Sea. A satellite imagery tasked by Fumihiko Ikegami. Captured by Gokturk-1. Delivered by @skyfi.bsky.social . Here we see two vents and numerous steaming meters-sized giant pumice blocks.

Another magnificent photo has been dropped... Aerial photo by Stanis Yohang. www.facebook.com/syohang1/pos...

The eruption of the unnamed submarine volcano at Bismarck Sea continues. Local fishermans posted the photos of the eruption as well as the pumice raft. 1-3. www.facebook.com/groups/19995... 4. www.facebook.com/photo?fbid=1...

CMT solutions, 100% natural (in fact, these are more like nuclear explosions rather than earthquakes.)

One of the most epic submarine volcanology pic has been dropped!! S2B_55MES_20260515_0_L2A browser.dataspace.copernicus.eu?zoom=13&lat=...

See you at the JpGU!

JMA starts selling the plush of Voluken（ぼるけん）, their mascot of volcano. The each corresponds to the alert level. Unfortunately, the online shop appear to ship only to Japan. You can also purchase them at the museum of JMA in Tokyo. harerun-shop.com/products/%E3...

Small tsunami, visible at Kuji, Iwate. www.youtube.com/watch?v=hHN_...

Literally big if true... A tomography study suggests that there is 5000 km3 of magma beneath Tuscana, Italy. The image is sketchy though. www.nature.com/articles/s43...

My last working day at the Geological Survey of Japan! In my next chapter, I weight more on the industries than academia.

JAMSTEC to cancel all research cruises in April because of the ongoing global oil shortage... news.web.nhk/newsweb/na/n...

Watching a strike-slip geomorhology every day reduces one's risk of cancer by 50%.

15 years. Never, never caught by tsunami.

In the beginning of 2020s, the humanity lost more than 10M people for the COVID-19. Then the war in Ukraine has consumed >1M people. Now wars are spreading to everywhere, and dictatorship is winning over the democracy. The 2020s is going to be the darkest era in this century. We all did wrong.

The cancer spreads.

Yup, it’s what we called the Kalimantan slab that lies in the transition zone. Broke off north Borneo and Palawan, about 15 Myr ago!

Metallic (specular) shading best matches for a cinder cone.

Nice www.geoanalyst.org/wp-content/u...

Very interesting paper from China. They drilled two 10-km holes in 2025 and found hydrocarbon from that depth. Zhu & Huang (2026) Comm. Earth Environ. Ultradeep drilling beyond 10 km revealing new insights into Earth systems and resources www.nature.com/articles/s43...

Diagram: Structure of the Deep Earth - by Fumihiko Ikegami ikegami.substack.com/p/diagram-st... The figure I've posted before + A bit of additional notes.

geoign/Geoscience_Figures: My original scientific figures for Geosciences github.com/geoign/Geosc... Adobe Illustrator .ai file is also available for editing. CC BY-NC 4.0 License.

Some impressive eruption photos (between 2004-2025) from Kirishima Geopark www.facebook.com/media/set?va...

English version! The colors of the mantle are based on the actual mineral colors (except lithospheric mantle). If you have any idea or suggestion, let me know!

Holiday drawing. (Don't worry. I'll create the English version too.)

Where Volcanoes Form on Earth? open.substack.com/pub/ikegami/... Many textbooks are still stuck at the level of understanding from the formative era of plate tectonics—over 50 years ago. In this article, I organize where on Earth volcanoes occur.