December 14 , 2015. EN. Copahue, Mauna Loa, Kanlaon .
December 14 , 2015.
Copahue, Chile :
Special volcanic activity report (REAV)
Bío Bío Region
December 13, 2015, 1:20 HL.
Based on the analysis of information collected by the monitoring stations installed near the Copahue volcano , Servicio Nacional de Geología y Minería (SERNAGEOMIN) – Observatorio Volcanológico de los Andes del Sur (OVDAS) announces:
Between 10h17HL (01h 17 GMT) on December 12 and 1:09 HL (04h09GMT), December 13, on the Copahue volcano, occurred a seismic swarm consisting of 103 seismic events volcano-tectonic type associated with the rupture of rigid material, located in the North-Northeast, at a distance of 12 km from the main crater at a depth close to 6.0 kilometers.
The highest earthquake energy of the swarm presented a local magnitude of M 3.1 and was recorded at 12h57 HL (03h 57 GMT).
Latitude -37.790000 °
Length -71.051333 °
Depth: 5.49 km
Distance Crater: 12.9 km
No changes were recorded in the activity of the volcano that is attributable to seismic swarm.
The community of Caviahue (Argentina) reported the perception of seismic events in their area by the population.
At the time of publication of this report, the earthquake swarm continues with lower energy.
The technical level alert remains at level yellow .
The SERNAGEOMIN -OVDAS continuous online monitoring, and timely inform on possible changes in volcanic activity in the region.
Source : Sernageomin.
Photo : telam.com.ar
Mauna Loa, Hawaï:
19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
On Thursday, September 17, 2015, the Volcano Alert Level and Aviation Color Code for Mauna Loa was elevated to Advisory/Yellow based on long-term trends in both earthquake and deformation monitoring data.
An aerial view of the 1940 cinder-and-spatter cone on the floor of Mauna Loa’s summit caldera as seen from the southeast. The west wall of the caldera (background) is about 170 m (560 feet) high. Most of the caldera floor around the cone is covered by lava flows erupted in 1984.
Mauna Loa is not erupting. The seismicity rate continues above background, though it has not increased above rates observed in recent months. In the last week, earthquakes occurred mostly beneath Mauna Loa’s upper Southwest Rift Zone at depths less than 5 km (3 miles). Continuous GPS measurements continue to show deformation consistent with inflation of magma reservoirs beneath the summit of Mauna Loa Volcano.
Source : HVO .
Photo : Peterson / USGS 1975
BULLETIN , Décember 14 2015 , 08h00
Kanlaon Volcano’s seismic monitoring network recorded five (5) volcanic earthquakes during the past 24 hours. Two (2) low-energy ash eruptions from the active summit crater were visually observed. However these events were not detected by the seismic network, indicating a shallow volcanic source. The first ash eruption occurred at 9:51 AM, producing light gray ash clouds which reached 100 meters above the summit before slowly drifting southwest. A second ash eruption occurred at 10:08 AM, producing light gray ash clouds which reached 200 meters above the summit and again slowly drifted southwest. Traces of ash were reported at Sitio Bais, Brgy Yubo, La Carlota City on the western slopes of Kanlaon Volcano. Background activity was characterized by the emission of wispy to moderate emission of light gray steam plumes that rose up to 200m from the summit and drifted to the southwest.
Alert Level 1 status remains in effect over Kanlaon Volcano, which means that it is at an abnormal condition and is in a period of current unrest. The local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the further possibilities of sudden and hazardous steam-driven or phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as airborne ash from a sudden eruption can be hazardous to aircraft. DOST-PHIVOLCS is closely monitoring Kanlaon Volcano’s activity and any new development will be relayed to all concerned.
Source : DOST-PHIVOLCS
Photo : GVP