July 20, 2015. English . San Cristobal, Mauna Loa, Etna.
July 20, 2015.
San Cristobal, Nicaragua :
An earthquake of magnitude M 4.5 on the Richter scale shook on July 19 the San Cristobal volcano, in the northwest of Nicaragua, causing no casualties or damage, even if he has sown the alarm among the population, officials said.
The quake was recorded at 3:25 local time (9:25 GMT) and its epicenter was on land, 10 kilometers north of San Cristobal, Department of Chinandega, said the Nicaraguan Institute of Territorial Studies (INET) in a report. The earthquake occurred at a depth of 14.6 km, and was caused by an event related to local defects in the Nicaraguan volcanic chain, said seismologist of INETER, Petronila Flores.
The quake was reported by residents of the municipalities of Chinandega department, near the volcano. The authorities have reported no casualties or damage from the quake. The San Cristobal, 1,745 meters high, is the highest volcano in Nicaragua, and is located on the « line of fire » of the Pacific and in the « chain of volcanoes of Nicaragua », composed of 13 active cones on the Pacific coast.
Source : La Prensa .
Photo : Radionicaragua
Mauna Loa , Hawai :
19 ° 28’30 « N 155 ° 36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
View from above Mauna Loa’s upper Northeast Rift Zone looking across an unnamed cone toward Mauna Kea.
Seismicity at Mauna Loa remains elevated in several parts of the volcano, however activity has been lower than in previous months. Earthquake rates on the upper Southwest Rift Zone (Sulfur Cone) and Moku’aweoweo Crater remain elevated, with nearly 100 located earthquakes occurring in June. Though there were no swarms on the west flank of Mauna Loa, earthquake rates remained above background with approximately 17 earthquakes occurring in June. All earthquakes in the past month have been small relative to earthquake sequences observed before eruptions in 1975 and 1984.
The 1940 cone, just above center, pokes up above the otherwise relatively flat floor of Mokuʻāweoweo – the summit caldera of Mauna Loa. Mauna Kea rises up in the background.
The Mauna Loa GPS network recorded a resumption of inflation during early to mid June, after an approximately month-long lull. It is too early to establish the exact rate and pattern of inflation, but so far, the predominant average motions during June are similar to average motions since this current episode of inflation started in the summer of 2014. Preliminary modeling of the long-term pattern suggests at least two inflating reservoirs–a spherical reservoir near the southeast wall of the summit caldera, and a tabular body that lies beneath the caldera and upper Southwest Rift Zone.
No significant changes in SO2 and CO2 were recorded by the continuous fumaroles monitor during June, 2015. The fumarole temperature sensor continued to record a decline that began on 08 May. Since that time, the temperature as decreased from 82 to about 79 degrees by the end of June.
Source : HVO.
Photos : HVO
Etna, Sicile :
The North East crater has small ash emissions for several days. The INGV has for the moment no comment.
The tremor shows him, no significant change.
A new crisis of the Sicilian giant?
Photo : Turi Caggegi / iEtna