seismicity

Quick news updates for a Wednesday... The island (and volcano) of Gran Canaria in the Atlantic Ocean. It last erupted in ~20 B.C. The earthquakes keep coming at Yellowstone - up to a M3.5 in the last 24 hours. Time has already put up an article wondering about whether people need worry about the swarm (there might be other things to worry about before this swarm). YVO's statement on the earthquake swarm seems pretty standard (as it should be): "At this time the Yellowstone Volcano Observatory does not consider the swarm to be unusual and the earthquakes are likely related to tectonic fault…
A hot spring in Yellowstone National Park. Image courtesy of the USGS. Yesterday I left a little teaser about the current earthquake swarm going on at the Yellowstone Caldera. Eruptions readers have come through with even more information on the swarm. Over 250 earthquakes have occurred in the park over the last few days, most between 0.5-3.1 on the Richter Scale - and getting larger each day. The swarmtarget="_blank"> is centered 10 miles northwest of Old Faithful, Wyoming and 9 miles southeast of West Yellowstone. However, before everyone gets too excited, Dr. Robert Smith of University…
Busy busy today with the first day of spring semester classes, but ... Yellowstone is having a nice little earthquake swarm, eh? Likely it is nothing beyond fluid flow as the earthquake are shallow, but hey, it is still fun to see.
Sometimes it is easy to feel overwhelmed by a disaster like the earthquake in Haiti - I mean, how much can someone sitting in their office thousands of miles away do? It isn't really feasible for most people to pull up stakes and go to give first-hand assistance during the recovery - but you feel like you need to do something. The first step is just trying to offer whatever assistance you can in whatever limited way you can. Many of us might not have a lot of money to spare - but that is the key word, "spare". That means "leftover". That means you have money to begin with - so some sacrifice…
Somehow I haven't posted a bunch of interesting items collected over the last few weeks, so I need to catch up. A pre-emptive hat tip to everyone who has sent me links or notes that might seem familiar in this post. Tungurahua in Ecuador erupting in 2000. First off, those of you looking for information on the Haitian earthquake that devastated the capitol Port Au Prince, Highly Allochthonous has post on the tectonics of the quake. Right now, it is hard for me to come up with a worse location in terms of devastation for a quake to have hit in the Caribbean Basin. Back in volcano news, a lot of…
This isn't directly volcano-related, but the USGS (and CNN) are reporting that a 7.0 earthquake just occurred in Haiti. Looking at the map, it seems that it epicentered only 10 miles/15 kilometers from Port Au Prince, the biggest city in Haiti. The earthquake was at 10 km depth - so a fairly shallow earthquake related to the complex transform faulting along the boundary of the Caribbean and Atlantic plates. A Tsunani Watch has been issued for the Caribbean as well - but the US Pacific Tsunami Warning Center believes that the only effects will be local (within 100 km) of Hispaniola.
The steam plume from Turrialba on December 26, 2009. Image by Eruptions reader Sahrye Cohen. Turrialba Costa Rican officials extended the evacuation zone around Turrialba from 3 to 6 km, raising the alert status at the volcano to Yellow. Vanessa Rosales of the National Emergency Commission described the seismicity as "intense but low," but says the country is prepared to deal with the emergency. As always, the news chooses oddly what is the "news" of an event, and many article on Turrialba focus on Costa Rica's coffee - yes, it is safe, so far. A news report from the Tico Times quotes Raul…
A pile of news for the new week! The glow of new lava flows from Nyamuragira in the Congo, taken from the Virunga Park Headquarters, January 2, 2010. MayonPHIVOLCS may lower the alert status at Mayon to Level 2 after almost a week of lower seismicity and no ash explosions since December 29th. Schools that were being used as evacuation centers were also returned to teachers and students for the start of classes after the Christmas holiday. However, the Albay provincial government is now considering a plan to permanently move everyone who lives within the 6-km danger zone around Mayon, even if…
2009 is over! If you missed the Volcanic Year in Review, check out my summary of the volcanic events that captivated many of us over the past year. However, only one event will get the coveted 2009 Pliny for Volcanic Event of the Year. A lot of you wrote in with votes and comments - I thank you - and a number of events stood out in your mind. Here we go: Honorable mention A few volcanic events got multiple votes: - Soufriere Hills on Montserrat. - Mando Hararo in Ethiopia. - Chaiten, Chile and the new research on the eruption. - The earthquakes in western Saudi Arabia under the Harrat…
Here it is, my attempt to recap a year's worth of volcanic events. By no means is this supposed to capture every event, but rather the highlight/lowlights and what most captivated me during 2009. I'll be announcing the winner of the 2009 Pliny for Volcanic Event of the Year tomorrow. Waimangu Geothermal Valley in New Zealand, taken in January 2009 by Erik Klemetti. January The year started out with a trip to New Zealand (well, for me at least) and vistas of the Waimangu Valley, formed in the 1886 eruption of Tarawera on the North Island. We were also still thinking about the late 2008…
Not much new to report today, so I'll just add some notes to the two volcanoes in the news right now: Mayon and Redoubt. Mt. Redoubt in Alaska, taken on September 23, 2009. Image courtesy of AVO/USGS, taken by Game McGimsey. Mayon: The volcano continues to show signs that a major eruption is in the works, but nothing new occurred over the last 24 hours. 2 km / ~5,000 foot ash plumes were produced from the new dome/flow complex, causing a potential aviation hazard, and the lava flows continued to be erupted. In evacuation news, animals are now being evacuated from the hazard zone around the…
The most recent image on the AVO website of the dome at Redoubt, taken in November 2009. Image courtesy of AVO/USGS, by Cyrus Read. Not much information on this, but AVO just raised the alert status at Redoubt in Alaska to Yellow for the first time since late September. A series of small earthquakes were detected near the summit dome starting at 10 A.M. today, prompting the change of status. The link to the complete text of the change in status doesn't seem to work on the AVO site, so here it is: 2009-12-28 09:53:11 - VAN/VONA AVO is raising the Aviation Color Code to YELLOW and the Volcano…
Lava flows from Mayon, taken December 23, 2009. Volcano news over the holidays this year is still focused on Mayon in the Philippines. We're reaching almost a month since the volcano starting showing signs of a major eruption, but no "big one" yet. Lava flows, ash and block-and-ash flows are continuing to be issued from the new dome at the summit, but earthquakes are down some - which is leading to the problem that people are thinking the volcano is "safe". Many evacuees are returning home already, even with the threat-level at Mayon is unchanged. This danger of people losing faith/not…
Looks like last night was busy, volcanically speaking. Eruptions readers noted that VAAC warning of ash from both Mayon (to 10,000 feet / 3.0 km) and Bezymianny (to 32,000 feet / 10 km) were issued {hat tip to Chance Metz for the updates}. Here is some more news on these ongoing events: Mayon erupting in December 2009. Mayon, PhilippinesEvacuations are continuing near Mayon in the Philippines, some of them forcibly by the local authorities. PHIVOLCS is reporting that SO2 output from Mayon has jumped from ~750 tonnes/day to almost 2,800 tonnes/day over the last 24 hours and seimicity continues…
A new Weekly Volcano Report from the Smithsonian GVP/USGS ... enjoy! Highlights include: There has been a number of reports of new activity at Llaima in Chile (hat tip to Eruptions reader Manuel Humeres for bringing them to us). Most of the current activity is steam-and-gas plumes along with long-period seismicity, suggesting we could be headed towards a new eruption. Lava flows continue to erupt from Kliuchevskoi in Kamchatka, along with strombolian activity throwing ejecta up to 300 m / ~1000 feet above the crater. Rabaul is busy shaking windows 20 km / 12 miles from the Tavurvur crater,…
Undated image of Cerro MachÃn in Colombia. I just picked up on this story over on the Volcanism Blog, but I want to post it here too. MachÃn, in Colombia, has experienced a sharp increase in seismicity at the volcano - maintaining the Yellow status for the volcano. 54 earthquakes were recorded at the volcano over the weekend, prompting the INGEOMINAS to raise the alert status. The volcano had a swarm in 2008 that did not lead to any eruption - but remember, better to be safe than sorry. If MachÃn were to erupt, it would join Galeras and Huila as erupting volcanoes in Colombia. Not much is…
Here is Part 2 of the Q&A with Dr. Boris Behncke. You can also check out Part 1. Undated image of Stromboli in eruption. (Shirakawa Akira) 1. Would a large scale eruption (VEI 5 or greater) of Mt. Etna like the ones occurred in 122 BC and 1500 BC (disputed) be possible again in the foreseeable future? Or is the volcano slowly "dying" although the last eruption ended in July 2009 has been one of the longest ever recorded? 2. Not really related to volcanism, but close: does INGV plan to distribute seismic data from seismic stations of its Rete Sismica Nazionale, including stations from…
Karkar volcano as seen from space. Eruptions reader The Bobs left a note mentioning that there may have been a 'significant' eruption at Karkar in Papua New Guinea. The only place I can find information is John Seach's Volcano Live: An eruption occurred at Karkar volcano at 6:39 pm on 25th November 2009. The eruption plume reached a height of 45,000 ft. A magnitude 5.1 earthquake hit 90 km SSE of Karkar volcano 7.5 hours before the eruption. I don't know too much about Karkar, but the GVP says that it is a volcanic island made of a pair of calderas, with the inner caldera formed in the last 1…
Mayon volcano in Albay province, Philippines. Yesterday, Mayon in the Philippines, which has been showing signs that it might be headed towards a significant eruption, produced an ash plume that reached as high as 3.5 km / 12,000 feet according to some reports. Evacuations of villages near the volcano have begun, while many other towns have been supplied with wireless announcement systems to help with evacuating if the volcano continues to show signs that it will experience a significant eruption. Last week, there were reports that a new dome was forming at the summit of Mayon and if this new…
The volcanoes of Italy must have known that Dr. Boris Behncke would be in the Q&A spotlight here at Eruptions because three have shown signs of new activity over the last week. Here is a quick summary based on information from Dr. Behncke and Sonia Calvari of IGVN. Etna erupting in 1989. Image by Dr. Boris Behncke. Etna On November 6, Etna in Italy appears to have entered a new phase of activity. The volcano had not produced any explosive events since July 4, 2009, but since 11/6, Etna has experienced a series of deep-seated explosive events - some of which suggest there is a lava lake…