geohazard

Southeast Wildfires

We’re used to hearing about devastating wildfire in the US southwest, but not the southeast. About 44 wildfires across 7 states have burned more than 100,000 acres (40,000 hectares) since late October. At least 7 people are confirmed dead, others are missing, homes have been destroyed, and more than 14,000 people have been evacuated from affected communities.

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MT. HILONG2X/GEOHAZARD/CRITICAL WATERSHED MAPS

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Amo ini ka mahinungdanon an ato Mt. Hilong-hilong: Proclaimed Critical Watershed Forest Reserve na tag declare na sab na Protected Area for Endangered Wildlife (key biodiversity area or kba), vested with long use & water right pa nan NIA (since 1971), flood prone area pa based on the geohazard map … Pagkatapos MGB (Mines & Geosciences Bureau) pa gihapon an magbuot or mag-exercise nan administrative jurisdiction nan area. Unta mohunong na sila. Ihatag na jaon nila sa PAWB (Protected Area & Wildlife Bureau) nan DENR. Jaon nay isab tag-create na Protected Area & Management Board (PAMB) na amoy unta magplano sanan mag-manage nan jaon na area pero tagsuspende an tanan meetings sa rason na waya nam hibay-i. Amo ini kalisod an opisina na doble kara. Lisod tiboon sa isa ka opisina na an mandato mag-guba nan kabukiran (exploitation & utilization) sanan konserba o pagpanalipod nan kinaiyahan (protection & conservation).

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Remarkable video of a debris avalanche / lahar that occurred on Mount Rainier in Washington State, USA on 25th June. Further details on the Mount Rainier Climbing blog. (via The Landslide Blog)

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Well that’s terrifying

Earthquake in Japan

On November 22 local time, a large earthquake struck off the coast of Japan. The reported Moment Magnitude of this quake was 6.9, indicating a substantial energy release, but because the quake occurred tens of kilometers offshore no portion of land received more than light shaking. This video clip was shared automatically online after the quake – the feed links to the seismic network that monitors Japan and automatically records and shares clips and charts showing peak ground acceleration during the quake.

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Computer simulation of the formation of tsunami waves propagating away from a point where the ocean floor is uplifted.

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Here’s a narrated view of part of one of the faults that ruptured in the recent New Zealand earthquake, hosted by a geologist from GNS Science. That plane was uplifted in less than a second.

Before/After tornado photos

Google has been recently finding new and interesting ways to present the enormous quantity of data they have in Google Earth, including long-term satellite images of the growth and evolution of cities and landscapes.

These images are before (top) and after (bottom) satellite photos from Google Earth of the city of Moore, Oklahoma, which was heavily damaged by a tornado in 2013.

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MAP OF ALL KNOWN METEORITE IMPACTS ON EARTH

We aren’t as detached from the cosmos as some may like to believe. A recent map produced and published by CartoDB, an online mapping service site, shows where meteorites strike earth and with the relative magnitude of their impacts. The map shows both densely populated areas with frequent meteorite run-ins, such as the United States, North Africa, and Australia, and then some less common areas such as Canada and northern Russia. The lack of known impacts in those areas do not represent impacts just focusing on North America; instead they’re a result of low populations, lack of recording equipment, and geologic settings that don’t preserve impacts very well.

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Storm Chasers in Oklahoma videotaped this tornado on May 9.

Not Just a Cell, a Supercell!

This photo shows a supercell thunderstorm that swept across west Texas a few years ago. The photo was taken near the town of Ballinger, where the storm dumped hail up to the size of tennis balls and produced strong winds that damaged trees and power poles.

A thunderstorm is classified as a supercell storm if it contains a persistent rotating updraft, or mesocyclone. Supercell storms are responsible for some of the most intense severe weather, including tornadoes, very large hail, damaging winds, and floods.

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Second Largest Volcanic Eruption of the 20th Century

This week is the 25th anniversary of both the devastating Mount Pinatubo eruption, and of Typhoon Yunya hitting the Philippines. These two natural catastrophes struck the densely populated island of Luzon on June 15, 1991.

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The blue lava from this Indonesian volcano isn’t actually blue

The Ijen volcanic complex in Indonesia has been continually erupting for a good few years now, and has been extensively photographed because of its most distinct feature: its electric-blue lava. But the term “blue lava” is a bit of a misnomer — the flowing lava is engulfed by blue flames that gives the lava its iridescent glow, and those blue flames are the result of some simple but fascinating chemistry.

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This video was taken out the window of a plane flying over the active plume from Pavlof Volcano (previous post: http://bit.ly/21REGtv)

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This video is a high powered computer’s simulation of the New Zealand Earthquake earlier this month. The video shows the initiation of the earthquake rupture and then tracks the motion of the planet up and down and side to side as the waves from the earthquake spread out from the rupture. The video is played at roughly 2x the speed the waves actually propagated outwards.

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The Process of Hurricane Landfall

As the immensely powerful Hurricane Matthew (Category 4 as of this writing) tears through the Bahamas and bears down on Florida, now seems as good a time as any to discuss the behavior of hurricanes as they cross over coastlines onto land. Since the greatest impacts at landfall occur in and near the eyewall, let’s begin our discussion there.

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