August 12 , 2016. EN. Kilauea , Nevado Del Huila , Masaya .
August 12 , 2016.
Kilauea , Hawai :
19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Kilauea Volcano continues to erupt at its summit and from its East Rift Zone. The 61G lava flow continues to flow into the sea at Kamokuna and produce scattered breakouts on the coastal plain and pali. The flow poses no threat to nearby communities. The lava lake at Halema’uma’u Crater continues to be active, with a current level of 37.5 m (123 ft) below the Overlook crater rim.
The lava lake within the Halema’uma’u Overlook crater remains active; its surface dropped slightly to 37.5 m (123 ft) below the crater rim measured this morning. An explosion late Saturday night, triggered by a rockfall, sent a voluminous and dangerous shower of hot spatter and rock debris onto the southeast rim of Halema’uma’u. This explosion produced a continuous carpet of volcanic material covering a broad swath 80 m (260 ft) long and 50 m (165 ft) wide around the former Halema’uma’u overlook, an area now closed to public entry. Additional explosions from further rockfalls remain possible and can occur at any time with no warning.
Weak inflationary tilt of a summit *DI event continued. Seismicity rates continue to be normal, with tremor fluctuations associated with lava lake spattering. The average daily summit sulfur dioxide emission rate ranged from 400 to 7,500 metric tons/day over the past week.
Pu’u ‘O’o Observations:
No significant changes are visible on webcam images, with persistent glow continuing at long-term sources within the crater. Seismicity and tilt records also showed no significant changes in the past day. The sulfur dioxide emission rate from all East Rift Zone vents was about 400 metric tons/day when measured on August 10.
Lava Flow Observations:
The 61G lava flow, extending southeast of Pu’u ‘O’o on Kilauea’s south flank, continues to be active and to enter the sea at multiple places near Kamokuna. Scattered breakouts continue predominantly on the makai (seaward) portion of the coastal plain and on the pali. A small delta collapse occurred Tuesday afternoon which darkened the plume for a short time.
As a strong caution to visitors viewing the new ocean entry (location where lava meets the sea) for Flow 61G, there are additional significant hazards besides walking on uneven surfaces and around unstable, extremely steep sea cliffs. Venturing too close to an ocean entry exposes you to flying debris created by the explosive interaction between lava and water. Also, the new land created is unstable because it is built on unconsolidated lava fragments and sand. This loose material can easily be eroded away by surf causing the new land to become unsupported and slide into the sea. Finally, the interaction of lava with the ocean creates an acidic plume laden with fine volcanic particles that can irritate the skin, eyes, and lungs.
« DI » is short for « deflation-inflation. » A DI event is an abrupt deflation of Kīlauea’s summit that lasts from several hours to 2-3 days, followed by an abrupt transition to inflation that effectively cancels the preceding deflation over the ensuing hours to days.
DI events indicate a decrease and subsequent increase in pressure within a magma reservoir located about 1.5 km (1 mi) beneath the east margin of Halema‘uma‘u Crater.
The level of the summit lava lake generally tracks tilt during DI events, with the lava level dropping during the deflation phase and rising during the inflation phase.
Source : HVO
Photos : Sean King , David Ford.
Nevado Del Huila , Colombia :
Subject: Weekly Bulletin of volcanic activity of Nevado del Huila volcano.
The level of activity of the volcano continues:
At the activity level Amarillo or (III): changes in the behavior of the volcanic activity.
Analysis and evaluation of information obtained by the monitoring network of the Nevado del Huila volcano, during the week between 3 and 9 August 2016, the Colombian Geological Service, and the Volcanological and Geological Observatory of Popayan reports:
During the period evaluated, 113 seismic events were recorded, of which 55 were related to rock fracturing process (type VT) and 58 to fluid dynamics in volcanic conduits (type LP).
On the images obtained by cameras from Tafxnú, Maravillas, Caloto, La Palma and Verdun, the degassing process of the volcanic system was observed. The gas from the observed emission column were characterized white.
Sensors for technic deformation control , magnetic and acoustic sensors, recorded no change associated with volcanic activity.
Therefore, it is concluded that during the evaluation period of the volcano, this one continued to show stable behavior.
The Colombian Geological Service continues to be attentive and report timely to the changes that may occur.
Source : SGC
Masaya , Nicaragua :
At 12:52 on Saturday, an earthquake of M1,5 magnitude was recorded near the crater Santiago , on the Masaya volcano.
This earthquake had the characteristics to be induced by magma movement under the Masaya volcano, in the expected behavior for an active volcano.
There was no change in the other monitoring parameters of the volcano .
Masaya is one of Nicaragua’s most unusual and most active volcanoes. It lies within the massive Pleistocene Las Sierras pyroclastic shield volcano and is a broad, 6 x 11 km basaltic caldera with steep-sided walls up to 300 m high. The caldera is filled on its NW end by more than a dozen vents that erupted along a circular, 4-km-diameter fracture system. The twin volcanoes of Nindirí and Masaya, the source of historical eruptions, were constructed at the southern end of the fracture system and contain multiple summit craters, including the currently active Santiago crater. A major basaltic plinian tephra erupted from Masaya about 6500 years ago. Historical lava flows cover much of the caldera floor and have confined a lake to the far eastern end of the caldera. A lava flow from the 1670 eruption overtopped the north caldera rim. Masaya has been frequently active since the time of the Spanish Conquistadors, when an active lava lake prompted attempts to extract the volcano’s molten « gold. » Periods of long-term vigorous gas emission at roughly quarter-century intervals cause health hazards and crop damage.
Source : Ineter , GVP
Photo : Martin Rietze