A bit of a good news on Mayon: PHIVOLCS has lowered the alert level to Alert Level 3. Hopefully, things will go back to normal and all those affected will be able to go back to their homes. In the meantime, here are two of the latest satellite images of Mayon from Sentinel 2 since... Continue Reading →
Last time, I mentioned that what hit Mocoa, Colombia were not floods or mudflows, but debris flows. But what exactly is a "debris flow?" This term isn't very well-known, at least in popular usage. Indeed, numerous reports describe the Mocoa tragedy as caused by either a mudflow, mudslide, or a landslide (which is technically correct,... Continue Reading →
(Image above: False color composite generated from Sentinel-2 data draped over Google Earth terrain) Although I've been to several volcanoes and have studied and worked on volcanic deposits before, this is the first time I've seen an eruption in person. I posted photos from our trip to Mayon, where we tried to document the eruption,... Continue Reading →
Mayon Volcano, the most active volcano in the Philippines, is erupting again. The activity started last January, and it's still continuing until now. Eruption types have ranged from Strombolian to Vulcanian. The volcano is continuously degassing, with some occasional lava fountaining. Here are some photos I took when got a chance to go there.
Last week, a deadly Mw 6.4 earthquake struck Hualien, Taiwan, killing dozens of people. The image is an interferogram processed from two descending . Sentinel 1 images dated February 5 and 11, 2018 using SNAP. The focal mechanism solutions are from the GEOFON Program. Take note that these are preliminary results, no additional corrections were... Continue Reading →
Mt. Agung, a volcano in Bali, Indonesia, has been experiencing unrest lately, and Indonesian officials fear that an eruption might be imminent, prompting thousands to flee. This is a differential interferogram generated from a pair of Sentinel-1 SAR imagery dated 28 August and 21 September 2017 downloaded from the Sentinel Data Hub and processed using... Continue Reading →
Photo above: At Inabanga, Bohol, where the ground rose about 3 meters. If you look closely, there's a person among the rubble, for scale. The 2013 Bohol earthquake was one of the Philippines' biggest earthquakes in recent history. It was a terrible disaster; killing a lot of people and damaging millions of pesos worth of properties. What's... Continue Reading →