Maui Nui Landsat Photo

Maui Nui – Big Maui

The four islands between Oahu and the Big Island of Hawaii are the remnants of a large volcanic edifice, referred to as Maui Nui, literally Big Maui. At its height some 1.2 MY ago, it was about 50% larger above sea level than the current Big Island of Hawaii. Following that peak the normal cycle…

The faults and slabs of the N Quadrant as revealed by the earthquake data from IMO (IanF & Deep Thought)

Ruminarian VII – Mass wasting…

Okay… what is a ruminarian?   Well, figuratively, we all are.   “Ruminate” is a slang term for standing around, thinking about something.   I adopted/co-opted the word to describe our activities, in part because it’s what we do, and also due to the sheep nature of the blog, following a hapless sheep incident that someone observed on…

Beautiful Lake Taupo, New Zealand. The only hint of its volcanic origin are the distant volcanoes on the horizon, built at the edges of the ring fault system. (Provenance unknown)

When Is a Caldera a Caldera?

It does not take long for a newcomer to volcano-watching, if we are to call our hobby that, to come across the term “caldera”, cauldron. The term is very loosely used to describe large volcanic depressions ranging from volcanic craters a few hundred metres in diameter up to the huge depressions left behind by the…

Holuhraun lava in daylight. Screenshot from a video by Kristinn Ingi Pétursson,

The Long Wait?

Yesterday, the Bardarbunga crisis celebrated its first month. As our readers have already remarked, the IMO has put out an update that summarises the earthquake data over the past month. In all, some 25,000 earthquakes have been registered by the automated system of which no less than 5,900 have been manually checked by a seismologist.…