Up-to-date, accurate topographic data are a crucial resource for volcanic research and risk mitigation efforts, in particular, for modeling volcanic flow processes at a detailed spatial resolution. In this paper, we examine the utility of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument currently operating on the NASA Terra satellite, which provides near infrared (VNIR) stereo imaging from which topography can be derived. We wrote software to generate digital elevation models (DEMs) from the ASTER level 1A product, which employs an automated stereo matching technique to calculate the parallax offsets between the images acquired by the nadir- and aft-looking sensors. Comparison of ASTER DEMs with DEMs derived from other sources (digitized 1:50 K topographic maps and aerial interferometric radar) at Ruapehu volcano reveal an RMS error of about 10 m for the ASTER DEM, in the absence of significant atmospheric water vapor. A qualitative…
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Since the 1991 climactic eruption of Pinatubo in the Philippines, various hazards have affected areas surrounding the volcano. The most significant of these hazards involve the redeposition of pyroclastic flow and fall deposits as lahars, deposit-derived pyroclastic flows, and ash falls due to phreatic explosions. Many of these processes occurred in areas that are inaccessible for ground observation and monitoring. We describe here how sequential remote sensing data obtained over the period December 18, 1991, to November 1, 2001, from the SPOT, ERS, RADARSAT, SIR-C/X-SAR, AIRSAR, LANDSAT 7 ETM, and ASTER sensors provide a means of monitoring the decade-long development of the post-eruption Pinatubo landscape. This method represents an efficient and safe alternative to time-consuming, physically demanding and risky field campaigns. We apply principal component analysis, image subtraction, band ratioing, and density slicing to these data to track the changes in the post-…
read moreThe Bulusan volcano in the central Philippines has been ejecting ash and steam since since 6 November 2010. According to the National Disaster Risk Reduction & Management Council (NDRRMC), at least 34 families, 205 persons, have already evacuated from Casiguran, Sorsogon so far.
Source: GLIDEnumber, News:XinHua
Indonesia's Mount Merapi erupted three times on Tuesday, causing thousands to flee; authorities had put an area 10 km around the crater on red alert Monday.
Source: GLIDEnumber
A case study about earthquake and vulcanian eruptions prediction .
read moreIndonesia issued a red alert after the Sinabung volcano on the island of Sumatra erupted, forcing the evacuation of thousands of people.
Although mount Sinabung's have spewed smoke and ash weaker than the first and the second day of eruption, the agency officials have not seen any signs to downgrade the alert status of the mount so far.
Australian Broadcasting Company says: "There are still around 23,000 internally displaced people (IDPs), living in camps. And volcanologists say the situation remains at the alert level."
Source: glidenumber
Source: ABC
UNOOSA/UN-SPIDER:
Focal Point:
Mr. Shirish Ravan
Email: …
Four people were killed in an eruption of Mount Karangetang in Sitaro Islands district, North Sulawesi province, early Friday.
Source: glidenumber
One of Indonesias most active volcanos erupted on Friday, sending lava and a searing gas cloud tumblingdown its slopes. At least four people have been confirmed dead, officials said, and several others were seriously hurt.
Mount Karangetang, located on Siau Island off the northern tip of Sulawesi, burst just after midnight when heavy rains broke the volcanos hot lava dome, spitting out 600-degree Celsius clouds of gas.
Ash and lava crashed down the mountains western slope, destroying at least seven houses, Priyadi Kardono, the spokesman of the National Disaster Management Agency (BNPB), told the Jakarta Globe.
Source:…
read moreHundreds have been evacuated after Volcano Tungurahua started spewing ash columns.
Source: glidenumber
read morePresident Alvaro Colom declared a state of emergency for the area near the Pacaya volcano, which lies 25 miles (40 km) from Guatemala City as the volcano erupted with a cloud of black ash that closed the airport and forced evacuations of nearby villages.
Source: glidenumber
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Status Update: 04/06/2010
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UNOOSA/UN-SPIDER:
Focal Point: Mr. Juan Carlos Villagran
Email: spaceaid [at] unoosa.org…
A massive cloud of volcanic dust has covered vast areas of northern Europe after the Eyjafjallajoekull volcano erupted in Iceland on 14 April. About 20 countries closed their airspace as consequence. The disruption has affected hundreds of thousands of travellers worldwide. An estimated number of 17.000 flights were cancelled during the first two days of the emergency.
Source: GlideNumber