April 05 , 2017. Reventador , Mauna Loa , Misti , California Volcanoes .
April 05 , 2017.
Reventador , Ecuador :
SUMMARY OF THE VOLCANIC ACTIVITY, Tuesday, April 4, 2017
The volcano maintains its strong activity. In the afternoon yesterday, gas and water vapor emissions were observed with an average ash content of up to 1000 meters above the crater, dispersing towards the northeast. At night, incandescent blocks descending on the flanks up to 1600 meters below the summit were observed.
TECHNICAL APPENDIX AND OBSERVATIONS
Since 11:00 am (TL) yesterday until 11:00 am (TL) today, three episodes of harmonic tremor (TRA), 4 episodes of tremor (ERT), 31 events long period (LP) and 48 explosions ) were recorded.
Observations, Emissions and Ashes: In the afternoon of yesterday, the volcano was partially discovered, allowing to observe an emission of water vapor with an average ash content of 1000 meters above the crater , Scattering to the northeast. At night, glowing blocks descending on the flanks up to 1600 meters below the summit were observed .. Today, the area of the volcano remained covered.
Rains and lahars: There were no rains.
The present report on a daily basis will be published at 12:00 (TL). In the event of an increase or a change in the behavior of the volcano, it will be immediately published a special report.
Source : IGEPN
Photo : Osteria
Mauna Loa, Hawai :
19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly in the past week, and persist above long-term background levels.
During the past week, only a few small-magnitude earthquakes occurred beneath the volcano, primarily in the upper Southwest Rift at depths less than 5 km (3 miles). An additional, small number of earthquakes also occurred on the west flank of the volcano at depths ranging from 0-14 km (0-9 miles).
Global Positioning System (GPS) measurements continue to show deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone.
Measurements from a continuously-monitored fumarole site within the summit caldera showed an increase in temperature during the first half of January, however, relatively steady fumarole temperatures were measured over the past week. No significant changes in volcanic gas emissions, sulfur dioxide or carbon dioxide were measured.
Source : HVO
Misti , Peru :
Sismo – volcanic monitoring:
VT-type events, related to the rupture of rocks within the volcano, showed similar behavior to that observed during the previous period (normal reference levels). On average, there were 43 VTs per day. This type of earthquake generated a maximum displacement of 3.3 cm2, a mean value recorded on the Misti.
As for the Tremor-type seismicity, linked to the continuous vibration of the system associated with the dynamics of the fluids (gas and water vapor), there was an increase in activity on 16 March. It should be noted that these events lasted during the last 10 days. This tremor activity is probably associated with the precipitation period.
Location of events:
The spatial distribution of VT events shows a dispersed seismicity, located beneath the volcanic zone, at a depth of 1 km and 4.8 km from the crater. The most energetic earthquake occurred on March 21 at 00:25 local time and was located near the crater, with a magnitude of 2.9 ML.
Thermal anomalies: The Mirova system (www.mirova.unito.it) of the University of Turin (Italy) did not detect any thermal anomalies on the Misti volcano during this period (VPR = 0 Megawatts).
SO2 Anomalies: The GSDM-NASA « EOS Aura » satellite system (http://so2.gsfc.nasa.gov/) did not detect significant anomalies of SO2 (magma gas) gas density on the volcano Misti.
VT-type events remain at a normal level, while Tremor-type earthquakes have shown an increase in duration. These events are probably associated with the precipitation period.
The epicentral distribution of VT earthquakes located activity between 1 km and 4.8 km deep, with an event at ML 2.9.
No thermal anomalies or high values of SO2 gas density were detected on the Misti volcano.
• In short, volcanic activity remains low.
Source : IGP
Photos : IGP
California Volcanoes , United – States :
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN
Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.
Observations for March 1, 2017 (0000h PST) through March 31, 2017 (2359h PDT):
Mt Shasta: No earthquakes at or above M1.0 were detected.
Medicine Lake: No earthquakes at or above M1.0 were detected.
Lassen Volcanic Center: One earthquake at or above M1.0 was detected (M1.72).
Clear Lake Volcanic Field: No earthquakes at or above M1.0 were detected. [Note: The typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M2.78].
Long Valley Volcanic Region: In Long Valley Caldera, 7 earthquakes of M1.0 or greater were detected, with the largest event registering M2.20. One earthquake at or above M1.0 was detected in the Mono Craters region (M1.60). One earthquake at or above M1.0 was detected under Mammoth Mountain, registering M2.77. [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event registered M2.40].
Ubehebe Craters: No earthquakes at or above M1.0 were detected.
Salton Buttes: Thirty earthquakes of M1.0 or greater were detected, with the largest registering M3.09.
Coso Volcanic Field: The typical high level of seismicity was observed, with 20 earthquakes M1.0 or greater. The largest registered M2.32.
The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted.
Source : Calvo
Photo : Archive