October 08 , 2017. EN. Copahue , Kilauea , Ili Lewotolo , Agung , Pacaya .
October 08 , 2017.
Copahue , Chile :
During this period, 133 seismic events were recorded, 27 of which were classified as volcano-tectonics (VT) associated with rock fracturing processes. The local magnitudes were less than or equal to M 1.8. The largest energy event was located in the east-northeast direction (ENE), 9.1 km from the active crater El Agrio, with a depth of 8.6 km. Similarly, 106 seismic events associated with fluid dynamics within the volcanic edifice were recorded, of which 71 were cataloged as long-period (LP) events with reduced displacement values (DRc ) of 17.3 cm2. Finally, there were 34 VLP (very long period type) earthquakes with a maximum displacement of 13.1 cm2.
During the whole period, a constant signal of low intensity tremor was recorded, associated mainly with the exit of the gases of the crater El Agrio. This signal showed significant CKD values of 0.5 cm2, with main dominant frequencies comprised in two bands, one around 0.5 to 0.6 Hz and the other between 1.1 and 1.7 Hz.
During the period from 17 to 27 September, there were 21 minor explosions, which were mainly visualized as containing ash, with column heights not exceeding 900 meters on the active crater. The energy associated with the seismic activity correlated with the explosions has not exceeded values of reduced displacements greater than 10 cm2, values considered as low for this volcano.
The IP cameras installed near the volcano recorded a constant degassing of the active crater (El Agrio), characterized by sporadic ash emissions. The largest column was directed to the south-east (SE), with a maximum height of 900 m. For a few days, during the night, an incandescence was visible when climatic conditions allowed to observe the volcano.
According to the data provided by two active GNSS stations, no surface deformation attributable to changes in the internal dynamics of the volcano is observed.
No emission of sulfur dioxide (S02) into the atmosphere has been reported in the volcano sector, according to data released by the Ozone Monitoring Instrument (OMI) Group (http://so2 .gsfc.nasa.gov /) and the National Environmental Satellite Information and Data Service (NESDIS) (http://satepsanoine.nesdis.noaa.gov).
No thermal alarm was reported in the area associated with the volcano during the second fortnight, according to the data processed by the average infrared observation of volcanic activity (MIROVA) (http://www.mirovaweb.it/ ) and (MODVOLC) http://modis.higp.hawaii.edu/).
This type of activity characterized by particle emissions and minor explosions continued, but with seismic energy levels and no deformation of the volcano that represent a basic scenario for this volcano. It is now evident that the ascent to shallow layers of a low volume magma body interacts with the hydrothermal system, inducing observed phenomena that can last for a long time in a state of semi-stability.
Therefore, the Copahue volcano remains at the technical alert level:
GREEN LEVEL: Active volcano with stable behavior – No immediate risk – Time for a possible eruption: MONTH / YEAR.
Remarks: It is recommended to apply preventive restrictions to access an area near the crater with a radius of 1000 meters.
Source : Sernageomin.
Photo : Auracania , TN.com
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
Eruptions at Kīlauea Volcano continue without apparent significant change. Lava from the episode 61g flow in the East Rift Zone continues to enter the ocean at Kamokuna. Surface lava flow activity persists on the upper portion of the 61g flow field and on the pali. Minor lava breakouts are scattered across the coastal plain to the ocean entry. These lava flows pose no threat to nearby communities at this time. Lava lake activity continues at the summit of the volcano, with lava lake circulation and spattering and minor fluctuations in the depth to the lava lake surface. Low rates of ground surface deformations and seismic activity persist across the volcano.
The lava lake within the Overlook Vent remains active. Webcams at vent’s rim show lake circulation and spattering and minor fluctuations in depth to the lake surface through the course of the day. This morning, the level of the lake surface appears to have dropped slightly from yesterday’s measured depth of ~32m (105ft) below the adjacent Halemaʻumaʻu floor. Sulfur dioxide gas emission rates ranged between 2200 and 4200 tonnes/day over the past 3 days. Summit instruments show small fluctuations in tilt. Seismicity continues at low rates, with fluctuations in tremor amplitudes related to lava lake spattering.
Puʻu ʻŌʻō Observations:
Webcams show persistent glow from long-term sources within the crater and from a small lava pond on the west side of the crater. The sulfur dioxide emission rates from the East Rift Zone vents have been steady over the past several months, remaining significantly lower than the summit emission rates. Low rates of surface deformations and low levels of seismic activity continue.
Lava Flow Observations:
Lava from the episode 61g flow continues to enter the ocean at Kamokuna. Surface lava flows are also active on the upper portion of the flow field and on the pali. Overnight webcam views rather persistently show lava flowing down the pali, and minor breakouts scattered across the coastal plain to the ocean entry. The episode 61g flows do not pose a threat to nearby communities at this time.
Source : HVO
Photos : Bruce Omori , HVO.
Ili Lewotolo, Indonésia :
The Ili Lewotolo volcano is located in Lembata district, in the eastern province of Nusa Tenggara, at an altitude of 1,423 meters above sea level. In history, the eruptions of G. Ili Lewotolo occurred in 1660, 1819, 1849, 1852, 1821, 1864, 1889 and 1920.
The last earthquake crisis of G. Ili Lewotolo occurred in January 2012, when on January 2, 2012 at 18:00, the level of activity of the volcano moved from Level I (Normal) to Level II (Waspada) and at 11:30 pm at level III (Siaga). The level of activity was lowered to level II (Waspada) on 25 January 2012 at 16:00 and returned to level I (normal) on 17 October 2013 at 10:00.
Visual monitoring of the Lewotolo activity was carried out continuously from the PGA Post in the village of Laranwutun. Results of visual surveillance over the past 2 months are as follows:
From September 22 to September 30, 2017, the weather was generally cloudy, with light to moderate winds directed east and west. The air temperature was about 21 to 44 ° C. The volcano was clearly visible. Smoke rising from the main crater was observed with a maximum height of 500 meters, low to medium pressure with a white color and a low to thick intensity.
From 1 to 6 October 2017, the smoke rising from the main crater had a maximum height of 500 meters.
From 1 to 6 October 2017, there was recorded 1390 earthquakes with an amplitude of 0.5 to 34 mm and a duration of 3 to 200 seconds. 9 non-harmonic tremors with an amplitude of 2.5 to 24 mm and a duration of 65 to 320 sec. 3 hybrid earthquakes / phases with amplitudes of 7 to 39 mm, and durations of 7 to 30 seconds. 48 shallow volcanic earthquakes with an amplitude of 3 to 43 mm and a duration of 2 to 20 seconds. 198 volcanic earthquakes with an amplitude of 2.5 to 43 mm, and a duration of 2 to 25 seconds. 43 local tectonic earthquakes with an amplitude of 17 to 44 mm, and a duration of 11 to 45 seconds. 19 earthquakes felt with an amplitude of 42 to 45 mm, duration of 25 to 100 seconds. 1 distant tectonic earthquake with an amplitude of 27 mm, 32 seconds.
Based on the analysis of visual observations and seismic data, on 7 October 2017 at 20:00, the level of activity of Ili Lewotolok is increased from level I (normal) to level II (Waspada).
Anchoring the eastern end of an elongated peninsula that is connected to Lembata (formerly Lomblen) Island by a narrow isthmus and extends northward into the Flores Sea, Lewotolo rises to 1423 m. Lewotolo is a symmetrical stratovolcano as viewed from the north and east. A small cone with a 130-m-wide crater constructed at the SE side of a larger crater forms the volcano’s high point. Many lava flows have reached the coastline. Historical eruptions, recorded since 1660, have consisted of explosive activity from the summit crater.
Source : VSI , GVP
Photo : Schady Muller , Panoramio.
Agung , Indonésia :
VOLCANO OBSERVATORY NOTICE FOR AVIATION – VONA
Issued : October 08 , 2017
Volcano: Agung (264020)
Current Aviation Colour Code: ORANGE
Previous Aviation Colour Code: orange
Source: Agung Volcano Observatory
Notice Number: 2017AGU11
Volcano Location: S 08 deg 20 min 31 sec E 115 deg 30 min 29 sec
Area: Bali, Indonesia
Summit Elevation: 10054 FT (3142 M)
Volcanic Activity Summary:
Medium pressure white plume, likely dominated by water vapor, is observed at 1245 UTC (2045 Central Indonesia Time) with a height of 1500 m above the summit or around 4642 m above sea level.
Volcanic Cloud Height:
Ash cloud not visible.
Other Volcanic Cloud Information :
The white plume is moving east slowly.
Seismic activity is characterized by swarm of volcano-tectonic events.
Source : VSI/Magma.
Pacaya , Guatemala :
Precipitation: 2.9 mm.
As was pointed out last week, there was increased activity. Strombolian explosions were observed, ejecting volcanic material at 30 and 40 meters above the crater, which resulted in the growth of an intracrateric cone, which can be seen from different flanks of the volcano, with a abundant degassing. The PCG seismic station records strombolian explosions and tremors associated with the rise of magma and degassing
Source : Insivumeh
Photo : Archive