Volcano activity of April 30, 2013 - Etna and Paluweh volcanoes (Etna new great video)

هذا آخر (تقريبا) يوميا وتعتزم متابعة التغييرات نشاط البراكين في جميع أنحاء العالم.
وهذا الموضوع كتب بواسطة جيولوجي رودجر ويلسون الذي يتخصص في الزلزالية بركان وVervaeck أرمان. لا تتردد في إخبارنا عن نشاط جديد أو تغيير إذا لم نكتب عن ذلك. -

30 أبريل، 2013 النشاط البركان

KVERT reports no change in eruptive/seismic behavior of the five active Kamchatkan البراكين: Tolbachik, Sheveluch, Kizimen, Bezymianny, and Karymsky today. Recent satellite data (from the MODIS and OMI platforms) show both SO2 and thermal anomalies associated with ongoing eruptive activity at Plosky Tolbachik. I have included recent MODIS real color images of Sheveluch and the Kamchatkan volcanoes we report on as a whole.

shiveluch_ali_2013099_lrg

Tolbachik_MODIS_Hotspots_20130430

Also included in today's report are MODIS real color images of the effects of ongoing eruptive activity at جبل إتنا (إيطاليا) و Paluweh volcano (eastern Java). In the Mount Etna photo: Note the landslide scree forming along the eastern flank of the Southwest Crater vent. This feature indicates increasing instability of the eastern flank of the rapidly growing Southwest Cone. With time, the cone has grown toward the upper headwall of the Valle de Bove (an even larger active landslide which may influence the location of eruptive vents) and in recent eruptions, has produced relatively small collapses of incandescent material in to the upper reaches of the Valle. My concern is that, with more time and growth of the cone, the collapses may become large enough to threaten downslope communities. It is fairly simple to calculate the runout distance of cold avalanches, but as a result of their latent heat and continued degassing, hot avalanches can move much greater distances across much more subdued terrain. Fine material which rises above the hot avalanches as a surge can travel even further irrespective of the surrounding terrain. This bears watching during future paroxysms, which I'm sure Italian civil authorities and volcanologists are aware of. As for the photo of Paluweh volcano: Both airfall and pyroclastic flow deposits, produced by repeated dome growth (continuing) and collapse now blanket the entire island. Note also the abundant floating pumice and ash on the ocean surface surrounding the island.

The impressive eruption smoke plume as seen from Catania (approx. 25 km from the summit)

The impressive eruption smoke plume as seen from Catania (approx. 25 km from the summit)

etna_ali_2013108_lrg

paluweh_ali_2013109_lrg

Elswhere,...

Shallow earthquakes have continued overnight at Iliamna بركان (ألاسكا متوسط) (المعهد الوطني للإحصاء محطة).

لا يوجد حتى الآن بيانات الزلازل المحدثة من كوليما volcano (Mexico). Activity at البركان volcano has dropped-off again, Exhalations have been relatively small (incorporating only minor amounts of volcanic ash) and avergaed less than on event per hour during the past 24 hours. The Popo seismograms shows low-level harmonic tremor, a magnitude M2.0 earthquake which struck the volcano late yesterday, and a few small exhalation event signals.

popoTlamacas20130430

Strombolian activity has diminished at both بكايا (غواتيمالا) (محطة PCG) و فويغو (station FG3) volcanoes overnight. Fine ashfall, primarily raised by rockfalls from the snouts of two lava flows currently descending the flanks of Fuego volcano, has been reported from villages up to 10 km distant. Fuego also continues to produce frequent series of "locomotive-like" chugs heard at appreciable distances from the cone. Vulcanian explosions, while relatively small in volume/size, have increased in number during the past 24 hours at the Caliente Dome of the Santiaguito Dome Complex (سانتا ماريا volcano) (station STG3). Observers report loud degassing noises coming at 43 second intervals from Santiaguito today.

After several months of heightened seismicity, activity has returned to background level at Telica volcano (Nicaragua) (station TELN). Telica is one of those "noisy" volcanoes which always exhibits (relative to other volcanoes worldwide) a high level of internal unrest. The recent very high level of earthquake activity at the volcano illustrates why seismic data cannot be the sole criterion for judging whether a volcanic eruption is imminent (imagine forecasting weather based solely on barograph readings!). I won't report on Telica volcano on a daily basis (of course, unless something interesting is occurring!) following today's report.

Periods of elevated volcanic tremor have occurred at سان ميغيل volcano (El Salvador) (station VSM) overnight. The tremor pulses are kind of hard to discriminate from also periodic telemetry "noise".

A swarm of small seismic events is presently occurring at POAS volcano (Costa Rica) (station POA2). The tiny earthquake are likely associated with rapid introduction of heat beneath/into the Poas crater lake.

Short-lived swarms of volcano-tectonic earthquakes continue to punctuate a relatively quiet period at نيفادو ديل رويز volcano (Colombia) (station OLLZ). Tiny local earthquakes and small gas (and ash) emission events are apparent on seismograms from Galeras volcano (station CUVZ) today. The emissions have continued on nearly a daily basis at the volcano for over a month now.

Galeras_20130428

Volcanic seismicity (in the form of elevated tremor and occasional explosion events) continues at التبخير volcano (Ecuador) (station RETU) today. The relatively steady and generally low-amplitude character of the seismicity indicates a somewhat "open" volcanic plumbing system and does not suggest (at this time anyway!) a major eruption in the offing. Amplitude of seismicity at Reventador volcano (station CONE) is quiet high today, but the Reventador volcanocam continues to show a largely white (SO2) plume emanating from the volcano.

Tungurahua_20130429

Volcanic tremor has remained reduced overnight at أبيض جزيرة بركان (نيوزيلندا).

Hurrah!! OMI satelite datya have been updated!!! Recent OMI images depict SO2-enriched plumes drifting from Tolbachik, Fuego, Nevado Del Ruiz, Mount Etna (Italy) and Nyiragongo (DRC) volcanoes. Plosky Tolbachik and Kilauea (Hawaii) continue to be the only volcanoes currently "hot enough" (or not covered in thick cloud) to be detected in recent MODIS satellite global transits.

الكلام عقلك

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