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Ol Doinyo Lengai volcano (Tanzania), activity update: shallow magma present

Tuesday Feb 20, 2007 16:16 PM | DOOR: TOM PFEIFFER

Glow from nearby (but hidden) lava pooling somewhere beneath the collapse pit in Lengai's crater (taken on evening of 31 Jan 07).
Glow from nearby (but hidden) lava pooling somewhere beneath the collapse pit in Lengai's crater (taken on evening of 31 Jan 07).

During our latest expedition to the active crater of Lengai volcano from early 31 Jan - 2 February 2007, no eruption of natrocarbonatite lava occured from the summit vents. According to local Maassai guides, the central area of the crater with the large collapse pit near the tall hornito T49b had not seen significant changes since last summer. 
From an open vent in the NE corner at the bottom of the pit at the base of the hornito, loud washing-machine like sounds of boiling lava was audible all the time. A large pool of lava must be found somewhere at very shallow depths in some caverns beneath that area. This assumption is confirmed by the glow of lava that was clearly visible one night from a second, smaller vent located about 30 m south of the large vent in the base of the collapse pit. One guide confirmed he had seen spattering of lava from this vent some two weeks earlier.


In addition to the loud sound of revolving lava underground, a constant, deep rumbling could be heard from the ground, resembling the sounds of very distant thundering. It was strongest in the NW area of the crater between the collapse pit and the fissure vents of the March 2006 lava flow. We think it might be an audible form of volcanic tremor more or less directly related to a magma volume still inside the same dike. When talking to local guides, they believe that a new, large-volume effusive eruption of lava from a similar area as in March 2006 might occur in the near future.
A GPS survey and some photographs of the area will be published here in the near future.

Vorig nieuws
Monday, Nov 13, 2006

We gladly announce two new study&walking tours we can offer you in Italy: one to the Bay of Naples from 8-15 April and a two-weeks tour of the Eolian Islands from 6-18 May 2007. Both tours will be guided by our Italian geologist Marta who is a true insider in both areas.

[meer...]
Saturday, Jul 29, 2006

A set of photos from our recent expediton to Nyiragongo volcano has been posted. The next tour to see this unique volcano and the endangered mountain gorilllas of the Virunga volcanic chain is now set to 21-28 Jan. 2007. Details on this page.

[meer...]
Monday, Apr 17, 2006

Because of the recent interesting volcanic activity at Merapi and Semeru volcano on Java, we point to two tours with open spaces for last-minute individual bookings:

... [meer...]
Friday, Mar 10, 2006

Due to lack of participants, we decided to cancel the tour to North Sulawesi and postpone it to 2007. As an interesting alternative, we can offer a special trekking tour in Java and Bali from 5-20 August instead. There are two open spaces available.

[meer...]
Saturday, Mar 04, 2006

We hare glad to announce that we can now offer an additional date for the tour on Nisyros island, Greece, this autumn: 6-15 October 2006. Details to the tour are found here

[meer...]

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