Tavurvur volcano at the edge of Rabaul caldera...

was responsible for the destruction of the entire town of Rabaul in 1994, now rebuilt as seen below. On this day it was actively venting steam, but little else.

View of Tavurvur from the ship as we enter the harbour within the caldera.  This is approximately the same vantage point as that seen in the dramatic video linked below.

View of Tavurvur from the ship as we enter the harbour within the caldera. This is approximately the same vantage point as that seen in the dramatic video linked below.

Close view of sandy ash that fell, meters deep, in 1994.

Close view of sandy ash that fell, meters deep, in 1994.

A staff member of the well-equipped Rabaul Volcano Observatory holds a modern seismometer. This lab was just recently outfitted two months ago with the assistance of the USGS and VDAP.

A staff member of the well-equipped Rabaul Volcano Observatory holds a modern seismometer. This lab was just recently outfitted two months ago with the assistance of the USGS and VDAP.

See video of the 2014 eruption of Tavurvur: https://www.youtube.com/watch?v=oMxIlXW56cQ

Read about 1994 eruption that buried the village of Rabaul: https://en.wikipedia.org/wiki/Rabaul

Prepping for Papua New Guinea...

with Zegrahm Expeditions, leaving in exactly one week. After traveling in polar regions for four-and-a-half months this year, this trip will feel like a tropical vacation! I’m looking forward to snorkeling on some of the most bio-diverse reef systems in the world.

Voyage map: Port Moresby to Rabaul.

Voyage map: Port Moresby to Rabaul.

Seismicity of the convergent tectonic setting (from USGS). Earthquake foci color coded red (shallow) to yellow (deep).

Seismicity of the convergent tectonic setting (from USGS). Earthquake foci color coded red (shallow) to yellow (deep).

Microplates in convergent boundary between Australian and Pacific Plates. From Holm, RJ et al., 2016, Post 8 Ma reconstruction of Papua New Guinea and Solomon Islands: Earth-Science Reviews.

Microplates in convergent boundary between Australian and Pacific Plates. From Holm, RJ et al., 2016, Post 8 Ma reconstruction of Papua New Guinea and Solomon Islands: Earth-Science Reviews.

An attempt to control an advancing lava flow...

occurred in January-July 1973 in Heimaey, Iceland, where a short-lived eruption of Eldfjell volcano nearly closed the tiny fishing harbor.

View of Heimaey and harbor from northern flank of Eldfjell volcano.

View of Heimaey and harbor from northern flank of Eldfjell volcano.

Hiking the recent lava flow towards Eldfjell volcano in the mist.

Hiking the recent lava flow towards Eldfjell volcano in the mist.

view-of-heimaey-and-le-boreal-from-volcano.jpg
View of Surtsey (erupted in 1963) from the bridge.

View of Surtsey (erupted in 1963) from the bridge.

Surtsey volcano in the Vestmannaeyjar archipelago off southern Iceland.

Surtsey volcano in the Vestmannaeyjar archipelago off southern Iceland.

Exploring Longyearbyen...

for four days, the northernmost town on Earth.

Searching the glacial moraine with Ida and Ryan for Paleocene plant fossils.

Searching the glacial moraine with Ida and Ryan for Paleocene plant fossils.

Me at the headworks to coal mine 2B above town.

Me at the headworks to coal mine 2B above town.

Inside the headworks at mine 2B.

Inside the headworks at mine 2B.

Exploring the coal mining headworks with Cobus and Blackjack.

Exploring the coal mining headworks with Cobus and Blackjack.

Svalbard poppy enjoying the short summer bloom.

Svalbard poppy enjoying the short summer bloom.

Jan Mayen is a remote and rocky outpost...

in the Norwegian Sea, a volcanic hot spot on which the most northern active volcano on Earth is found.

View on approach.

View on approach.

Beerenberg volcano, rising to 2,277 m (7,470 feet) above sea level.

Beerenberg volcano, rising to 2,277 m (7,470 feet) above sea level.

M/V Sea Spirit  at anchor.

M/V Sea Spirit at anchor.

An extraordinarily happy geologist, five months and nine days into “retirement.”

An extraordinarily happy geologist, five months and nine days into “retirement.”

Farewell to the Faroes...

as we continue to travel north across the Arctic Circle and towards Spitsbergen in the Svalbard archipelago.

The Faroe Islands are a pile of Paleogene-age basalts, deeply cut by magnificent fjords.

The Faroe Islands are a pile of Paleogene-age basalts, deeply cut by magnificent fjords.

poseidon britain to svalbard voyage map.jpg

Crystal Geyser on the Green River...

is an unusual and rare CO2-driven cold water geyser that is depositing a colorful mound of travertine. Furthermore, it’s the result of an improperly abandoned oil/gas exploration well immediately south of Green River, Utah, and it periodically erupts on 8 and 22 hour-long cycles that are poorly understood.

An older, innactive but natural travertine and barite mound, originally described by John Wesley Powell on his explorations in 1869: “W e stop to examine some interesting rocks, deposited by mineral springs that at one time must have existed here, but which are no longer flowing...  “

An older, innactive but natural travertine and barite mound, originally described by John Wesley Powell on his explorations in 1869: “We stop to examine some interesting rocks, deposited by mineral springs that at one time must have existed here, but which are no longer flowing...

Mini-rimstone dams on the steeper portions of the travertine mound.

Mini-rimstone dams on the steeper portions of the travertine mound.

The most active portion of the travertine mound.

The most active portion of the travertine mound.

Here’s an interesting technical reference about this unusual feature: http://www.llnl.gov/tid/lof/documents/pdf/334382.pdf