volcanic hazards
eklemetti | May 20, 2009A week's worth of volcano news in one sitting, thanks to the USGS and Smithsonian Inst.'s Global Volcanism Program.
Thanks again, Sally Kuhn Sennert for putting it together!
This week's highlights include:
Small ash column spotted at Manam, Papua New Guinea. We talked about Manam not too long ago.
More details of the ongoing submarine eruption at West Mata in the Mariana Islands.
The lava dome continues to grow on Redoubt, Alaska with no real collapse yet.
Pilots spotted small (2.1 km / 7,000 foot) steam/ash plumes at Suwanosejima, Japan.
5-6 km / 18-25,000 foot ash plumes were produced by…
eklemetti | May 18, 2009
Al-Baidha volcanoAl-Qider volcano in Saudi Arabia. Image courtesy of Ahmed Al-Hussaini.
I've been searching for more information on the Saudi Arabian earthquake swarm reported last week. A number of Eruptions readers have also added some on-the-ground info as well.
UPDATE 12:30PM Pacific: Here is a brief update via Reuters India. They mention that five villages are being evacuated as a precaution. Beyond that, not much new information and it does feature this line that makes me shudder: "The region lies on a fault line, according to SGS, which declined to comment on current magma levels,…
eklemetti | May 17, 2009
Mount Saint Helens less than 30 seconds after a sector collapse that triggered one of the largest eruptions in the Cascades in the last 500 years.
Today is the 29th anniversary of the dramatic eruption of Mount Saint Helens in Washington state. The eruption dramatically changed the landscape around the volcano along with greatly increasing our understanding of volcanic sector collapses and explosive eruptions. I was going to write a larger entry on the event, but alas, I will instead be lecturing to 100 UC Davis students about the event today instead (sorry folks!)
Instead, if you want to…
eklemetti | May 17, 2009
El Misti in Peru, as seen from Arequipa.
As I like to remind people concerning volcanic hazards, an ounce of prevention is worth a pound of the cure. This is not to imply we can prevent volcanic hazards from affecting us, but rather that proper mitigation in the form of monitoring, planning, education and practice can save countless lives (and dollars) when a volcano erupts. Officials in Peru seem to believe this, as they recently ran for practice evacuations for residents around El Misti, in the southern part of the country. Jersy Mariño from the Instituto Geológico, Minero y…
eklemetti | May 15, 2009Volcano news ahoy, today brought to you by Islands.
Lake Kivu, located along the border the Democratic Republic of the Congo and Rwanda
A gorgeous satellite image (brought to us by the NASA EO) of a steam plume and ash from the ongoing eruption at Shiveluch in Kamchatka. The ash distribution stands out remarkably well on the white snow, with the central circle of ash near the vent/dome and then the wind-aided ash blanketing the terrain to the northeast of the volcano (and a little bit to the south).
Nature has a post reminding us that one of the big hazards at Nyiragongo/Nymuragira is not…
eklemetti | May 13, 2009Here's the latest news from the USGS and SI Global Volcanism Program. It might not record every little volcanic noise in the world each week, but nothing like getting all the major volcanic events summarized on a weekly basis.
Highlights this week (not including Nyiragongo, Redoubt and Galeras):
The eruption at Rinjani in Indonesia continues, with elevated seismicity and 300-600 meter plumes.
Sporadic strombolian eruptions from the Crater C at Arenal, Costa Rica (since late April)
High seismicity, 100 meter domes and continued dome collapses continue at the two domes growing at Chaiten,…
eklemetti | May 12, 2009
Redoubt emitting a large steam plume in April 2009. Image courtesy of Calvin Hall.
A few snippets from the world of volcanoes:
The current eruptive cycle at Galeras continues to go strong. Officials with INGEOMINAS, the Colombian Geology Survey, believe the volcano will erupt again in the next few "days to weeks". The volcano last erupted a few weeks ago (in spanish) and caused quite a bit of panic in the city of Pasto at the foot of the volcano. An Orange Alert has been issued (in spanish) for the volcano.
Another volcano have is on the verge of a larger eruption is Nyiragongo in the DR of…
eklemetti | May 10, 2009
Manam in Papua New Guinea erupting in 2004
Five years ago, Manam volcano in Papua New Guinea erupted. The volcano is located on a 10-km island of the same name and when it erupted in 2004, it produced pyroclastic flows and lava flows to the tune of a VEI 4 eruption. It was decided that the 9,000 inhabitants of the island had to be evacuated but even so, five people died due to the eruption. However, there are still thousands of people in temporary care centers on the main island of Papua New Guinea. Tensions have flared with the local inhabitants, to the point that four former islanders have…
eklemetti | May 8, 2009Things are busy - both volcanically and personally - so I'm going to just give you some links to a bunch of exciting/interesting/insane news:
West Mata erupting on May 5, 2009 in the Lau Basin.
According to a bunch of news sources, the eruption at Fernandina in the Galapagos is over (in spanish). That being said, the PNG noted that there is still a lot of carbon dioxide and sulfur dioxide being emitted, suggesting there is still a lot of degassing magma beneath the vents - at what depth (and will it erupt) is the question.
There is a lot of speculation that Nyiragongo (DRC) is erupting or…
eklemetti | May 7, 2009
Anak Krakatau in Indonesia.
Eruptive activity is definitely on the uptick at Anak Krakatau. The Jakarta Globe is reporting that the volcano is "spewing molten lava 1000 meters in the air". I'm not entirely sure if that is accurate or that the volcano is throwing volcanic bombs or tephra that high. The head of the Volcanology and Geological Disaster Mitigation Center in Indonesia, merely referred to as Surono in the article (are we playing Brazilian soccer?), says that the volcano is "a high threat because the eruptions have started spreading." Again, I'm not too sure what that means, whether…
eklemetti | May 6, 2009All the eruptions fit to print from the Smithsonsian/USGS GVP Weekly Report.
A few highlights (not including Redoubt, Rinjani and Slamet):
Multiple ash plumes from Galeras (Colombia), some producing noticeable ash fall up to 35 km from the vent.
The Alert Level at Anak Krakatau, Indonesia was raised to 3 (out of 4) after a sharp increase in the number of explosions.
The Alert Level at Cleveland in Alaska was lowered from Yellow to "Unassigned" (no Green for Cleveland as there is no real-time seismic network for the volcano, thus no "background levels" to compare.)
Ebeko in Russia continues…
eklemetti | May 6, 2009
Nyiragongo as seen from Goma, Congo in 2002.
There isn't much to go on so far, but there are indications that an eruption has started at Nyiragongo in the Democratic Republic of Congo. Satellite images has found "thermal anomalies" at the summit and along a 3-km swath of the eastern and western slopes. The report mentions that these could be "fires and /or volcanic material" and more interestingly, noticed at least 6 times since April 10, 2009. From the sound of it, this might be multiple vents or a central summit vent with lava flows going to multiple sides of the volcano. The Volcanism…
eklemetti | May 6, 2009Some brief tidbits from the volcanic realms:
Active volcanism at NW Rota-1
Kilauea? Explosive? You might think of Kilauea as a volcano that generates impressive Hawaiian-style eruptions with fire fountains reaching 100s m and dazzling lava flows, but Don Swanson at HVO sees evidence of a big explosive event at Kilauea. This eruption was ~1,000-1,600 years ago and may have produced a plinian-scale eruptive column and threw cm-scale chunks up to 17 km from the vent.
The intermingling of life and active volcanism always seems counterintuitive, but when you're talking undersea volcanism, all…
eklemetti | May 5, 2009The clock is ticking for the new dome growing at Redoubt to collapse. What will happen if/when it does collapse? Good question!
The new dome at Redoubt. Image courtesy of AVO/USGS, taken by Game McGimsey, April 30, 2009.
Most likely, the following will occur:
First, extrusion of lava will cause the dome to over-steepen, precipitating the collapse (although a large seismic event could also trigger collapse as well). An excellent example of this is the spine that grew at Mont Pelee on Martinique in 1902 before the famous eruption that destroyed St. Pierre and killed >30,000 people.
When it…
eklemetti | May 3, 2009
Chaiten erupting in May 2008. Image courtesy of ONEMI.
Speaking of anniversaries, this weekend is the one-year mark for the Chaiten eruption (in spanish) in Chile, the first eruption at the volcano in ~9,000 years. Yes, indeed, the rhyolite eruption that caught most everyone by surprise is still going strong one year later, with two domes growing within the caldera (in spanish). The eruption produced some of the most impressive and sustained ash columns in years (see below) - climbing to 16 km/9 mi, abundant lahars and pyroclastic flows from the emergence and growth/collapse of the domes and…
eklemetti | May 3, 2009For those of you who might not be paying as close attention to Redoubt now as in the past, this is the latest from AVO:
Redoubt's 2009 eruption continues and appears to be gaining intensity. Seismic activity has increased markedly in the last 24 hours, showing stronger volcanic tremor and more frequent rockfall events. Minor emissions of ash have also been visible in webcam views during this time period. Steam emissions in particular have become more vigorous over the last 2 hours, with a steam plume now reaching approximately 18,000 feet above sea level.
Are we headed to a dome collapse in…
eklemetti | May 3, 2009
Mt. Barujari erupting in 1994. Image courtesy of Vulkaner.no.
Sometimes it is hard to appreciate how many volcanoes lie within Indonesia. However, within the last few weeks, no less than four Indonesian volcanoes have been put on alert to eruption or shown increased signs of activity - Slamet, Kirinci, Anak Krakatau and now Mt. Rinjani (above).
UPDATE 5/3/2009 11AM (Pacific): The volcano is erupting according to the Jakarta Globe. Seems like the activity so far is confined to small explosions emitting ash and gases. More info as I find it.
Rinjani is a popular tourist destination on the…
eklemetti | May 1, 2009
Redoubt in April 2009 with Anchorage in the foreground (along with two F-22 Raptors). Image courtesy of Calvin Hall.
It has been quite some time since I talked about Redoubt, mostly because the volcano has been in the "slow extrusion of a dome" mode that has not generated much beyond impressive steam (with some ash) plumes. The volcano continues to stay at Orange/Watch status. I did glean a few interesting facts and speculations about the future at Redoubt from Dr. Jake Lowenstern of the USGS the other day, including:
The new dome growing on the volcano has more room to expand than the 1989…
eklemetti | April 30, 2009
Volcano monitoring. Image courtesy of the USGS.
Last night I had the opportunity to see a talk given by YVO Scientist-in-Charge Dr. Jake Lowenstern as part of the Volcanological Society of Sacramento meeting and he gave a great talk on the state of volcano monitoring today in the U.S. He laid out a lot of details concerning the Volcano Hazards Program of the USGS and I thought I'd share some of them so we can all have an idea of the ups and downs of the VHP these days.
First off, nothing says fun like the U.S. Volcano Status Map! Apparently the dreaded watch "eye" was not meant to be a…
eklemetti | April 29, 2009The weekly USGS/SI roundup is out. Highlights (beyond Slamet) include:
Explosions (some heard 25 km away) and incandescent blocks that started fires at Galeras, Colombia.
Ash and tephra being thrown tens of meters into the air and a 4-m tall spatter cone being built at Pacaya, Guatemala
Also in Guatemala, Santa Maria's Santiaguito dome produced ash plumes and explosions.
Steam, ash and sulfur odors from the continuing eruption at Redoubt, Alaska.
Increased seismicity, steam and ash plumes along with a thermal anomaly at El Reventador in Ecuador