All posts by LL

Jaegihorn incident report

Messieurs Goldman and Davenport, in Switzerland for the McCombie nuptials, invited Ms Crockett and Mr Laursen to an attempt on the Jaegihorn, above Saas Grund in the Swiss Valais region. Goldman and Davenport charmed the hut mistress into providing extra victuals. With full bellies and a 4am start, Laursen led the team on a circular tour of a neighbouring moraine in a suspected effort to escape the climb.

When the fog cleared and the sun rose, however, the team identified the start of the Alpendurst route and commenced climbing activities culminating in a successful summit. From here the evidence grows patchier. The two rope teams lost sight of one another. Subsequent reports from CUMC Zurich stationmaster Kavanaugh place Goldman and Davenport on a dance floor at a castle outside Basel ca. 3am. Davenport failed to report to the post-climb debriefing in Dietikon while Goldman reported to Dietlikon instead. Kavanaugh relieved all parties of their duties in disgust.

See the original as it appeared in Cambridge Mountaineering: [pdf]

Mantle Recycles Far Faster Than Thought

The magma that rises from the mantle, forming new islands, may blast more than it bubbles. Where those plumes of magma originate — at the core-mantle boundary or the mantle-crust boundary — and how fast they rise to the surface are still open questions among volcanologists. But now a new study of minerals from the volcano Mauna Loa on the Big Island of Hawaii suggests that some elements made a 2,900-kilometer-long journey from the core-mantle boundary to Earth’s surface in as little as half a million years — quadruple the speed found by previous studies. Continue reading Mantle Recycles Far Faster Than Thought

Rumbles in the Alps reveal rockslides

The ricochet of a rock fall resonates in the mind of anyone who has heard it. But it also sets off subterranean waves detectable by far-off seismic stations — and now researchers are using those signals to remotely model rockslides.

Franziska Dammeier, an engineering geologist at the Swiss Federal Institute of Technology in Zurich, and her colleagues linked five metrics of seismic waves to five physical characteristics of rockslides: volume, runout distance (how far the rocks travel), drop height, potential energy and the angle of reach. The researchers reported their model last week in the Journal of Geophysical Research. Continue reading Rumbles in the Alps reveal rockslides