Pinatubo: Seismicity increased

Pinatubo in the Philippines is seismically unsettled. Yesterday PHILVOLCS detected 25 volcanotectonic earthquakes at the volcano on Luzon. The previous day, there were 8 tremors. The alert status is at “1.” It is interesting that at the beginning of the phase with increased seismicity, it was stated that the tremors were tectonic in nature. Apparently, the activity has shifted. It is also interesting that the capital Manila is encircled by the two volcanoes: while the Taal caldera is located 70 km south of Manila, Pinatubo is located 100 km northwest of the capital. Large eruptions could have a correspondingly strong impact on the metropolis, depending on the wind direction.

Sangay: Ash cloud detected

Let’s start not in alphabetical order, but with the apparently strongest eruption of the last 24 hours. This was delivered by the Ecuadorian volcano Sangay. According to VAAC, volcanic ash rose to an altitude of 12800 m and dispersed to the northwest. A smaller ash cloud rose to 6700 m and moved in the opposite direction to the southeast. Speculatively, the higher ash cloud was explosively produced and the smaller eruption cloud originated from a pyroclastic flow that descended on the southern flank of the volcano. Due to the permanent cloud cover, visual observations of the event are rare. What does exist, however, are reports that the sky darkened over the towns of Riobamba and Chambo. In addition, there were showers of ash. People showed concern. The volcanologists of IGEPN are also concerned: they fear that continued rains could trigger lahars.

Etna Paroxysm No 12

The 12th consecutive paroxysm on Etna began this morning. Activity began to increase significantly around 7:30 am. Already half an hour later, a lava flow began to emerge from the New Southeast Crater. In the meantime, the paroxysm has reached its peak.

You can see from the broad tremor base that the paroxysm was increasing comparatively slowly and has now been going on for quite a long time. It looks like it peaked at 10:30 CET (9:30 UCT). The tremor amplitude has risen even a bit higher than during the last paroxysms. Once again, the eruption takes place in unusually good weather. There is almost no wind and the eruption cloud rises vertically. VAAC Toulouse detects volcanic ash at 10,400 m altitude. On a thermalcam, one can see the lava flow that has descended far into the Valle del Bove. Obviously, however, there is only the lava flow in the eastern direction, no lava seems to be on the way in the south.

Taal: Alert level raised

PHILVOLCS has been reporting for several weeks an increase in seismicity under the large Caldera volcano on Luzon, which caused a stir with an eruption only last January. In addition to numerous volcanotectonic earthquakes, volcanic tremors also increased significantly recently. The total number of volcanic tremor events has risen to 866 since the increased activity began on February 13. The volcanic tremors have increased seismic energy compared to previously recorded episodes and have ranged from 3 to seventeen 17 minute durations. In addition, the other parameters that indicate magma is moving at shallow depths are beginning to change: the acidity of Crater Lake increased, rising (or falling) from pH 2.79 to pH 1.59. The water is becoming more acidic because of increased volcanic gases rising. The water temperature increased to 74.6 degrees. Slight bottom deformation was detected using InSAR imagery. Concomitant changes in microgravity were recorded. New measurements have detected positive microgravity changes throughout the Taal caldera, consistent with density changes due to magma migration, magma degassing, and hydrothermal activity. All of these parameters are of concern and the alert status has been raised to “yellow.” Evacuations have not yet been initiated. Authorities remind that Volcano Island is a permanent exclusion zone. The photo shows the volcano during last year eruption.

Iceland earthquake M 5,0

Iceland’s Reykjanes Peninsula experienced a new earthquake with a magnitude of 5. According to IMO, the earthquake was detected at 02:02. The epicenter was located about 3 km west-south-west of Fagradalsfjall. Already at 0:22 a short tremor phase was registered. It lasted 20 minutes and can be seen on the graph by the fact that also the frequency bands 0.5-1 Hz and 1-2 Hz deflected. This was followed by a general increase in seismicity, at the peak of which the M 5.0 earthquake occurred. Interestingly, the EMSC located this earthquake on the northern coast of the Reykjanes Peninsula, in the immediate vicinity of the national capital. The EMSC gives a magnitude of 5.2.

Pacaya: Eruption in Progress

Unlike Etna, Pacaya did not take long to erupt and has been delighting with a fancy lava fountain for hours. INSIVUMEH reports glowing tephra rising up to 700 m above crater level. An ash cloud is rising up to 4500 m above sea level and drifting towards the southwest and west. In the communities downwind, ash and lapilli are raining and there is even a warning that blocks will fall. Likewise, there is a warning that lava flows may be formed, or that existing lava flows may increase. So it remains exciting at the volcano. It is noteworthy that there is a new livecam from CONRED, which is currently transmitting a livestream (see below).

Mw 6.1 KERMADEC ISLANDS REGION

Real-time – Last 50 earthquakes worldwide M6+

Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.1
Region   KERMADEC ISLANDS REGION
Date time   2021-03-06 07:16:29.8 UTC
Location   28.56 S ; 176.99 W
Depth   15 km

Author: USGS

Mw 6.4 OFF E. COAST OF N. ISLAND, N.Z.

Real-time – Last 50 earthquakes worldwide M6+

Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.4
Region   OFF E. COAST OF N. ISLAND, N.Z.
Date time   2021-03-06 00:16:21.2 UTC
Location   37.59 S ; 179.55 E
Depth   8 km

Author: USGS

mb 6.2 KERMADEC ISLANDS REGION

Real-time – Last 50 earthquakes worldwide M6+

Another strong earthquake was detected by the USGS. Further details are:

Magnitude   mb 6.2
Region   KERMADEC ISLANDS REGION
Date time   2021-03-04 23:12:57.9 UTC
Location   28.52 S ; 176.70 W
Depth   10 km

Author: USGS

mb 6.1 KERMADEC ISLANDS REGION

Real-time – Last 50 earthquakes worldwide M6+

Another strong earthquake was detected by the USGS. Further details are:

Magnitude   mb 6.1
Region   KERMADEC ISLANDS REGION
Date time   2021-03-04 20:25:07.2 UTC
Location   28.41 S ; 176.87 W
Depth   10 km

Author: USGS