النشاط بركان 22 أبريل، 2013

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. -

22 أبريل، 2013 النشاط البركان

الزلزالية لا يزال مرتفعا في نيفادو ديل رويز volcano (Colombia) (station OLLZ), with numerous magnitude M2.0 - M2.5 earthquakes overnight. Earthquake activity at the volcano has remained steady which may explain the lack of higher magnitude events (M3.0 - M4.0) observed during the previous two days. Those higher magnitude events followed/terminated periods of reduced earthquake activity at the volcano. INGEOMINAS reports strong degassing at the summit and occasional light ashfalls are reported by surrounding communities.

Numerous low-amplitude volcanic earthquakes have merged into essentially continuous volcanic tremor at سان كريستوبال volcano (Nicaragua) (station CRIN), and numerous small volcanic earthquakes (and tremor) continue at Telica volcano (station TELN).

في مكان آخر،...

KVERT reported no significant changes in seismic/eruptive activity at: Tolbachik, Sheveluch, Kizimen, Bezymianny, and Karymsky volcanoes (Kamchatka Peninsula) overnight. Moderate seismicity continues at hydrothermally active Gorely بركان.

Tolbachik_MODIS_Hotspots_20130422

Numerous rockfalls (signifying rapid lava dome growth) and occasional small pyroclastic flows affect كوليما volcano (Mexico) again today. Exhalative activity is low (averaging less than one event per hour) at البركان volcano with low level volcanic tremor visible on seismograms there (as well as the magnitude M5.9 regional earthquake which struck the southwest coast of Mexico early today). Photographs from a recent overflight (16 April) by CENAPRED scientists shows the explosion crater excavated by recent explosive activity at Popo has already been filled by lava flows (a "pancake" lava dome).

Popocatepetl_lava_dome_20130416

Strombolian activity strengthened late this morning at بكايا volcano (Guatemala) (station PCG), and strombolian activity has remained strong at فويغو volcano (station FG3) overnight. Volcanic ash-laden explosions have also been more frequent at Santiaguito Dome Complex (سانتا ماريا volcano) the past few days. Villages within a ten kilometer radius of both Fuego and Santa Maria have reported light ashfalls during that period.

Santiaguito_20130422

Fuego_20130422

Volcanic tremor recently increased at ماسايا volcano (Nicaragua) (station MASN). Note that another brief increase oocurred as long-period surface waves from a distant earthquake passed the volcano. I have noticed this to be frequent occurrence at Masaya (especially with the recent flush of large earthquakes worldwide!).

What appear to be small volcanic earthquakes affect POAS بركان (كوستاريكا) (محطة POA2) اليوم.

Numerous tiny local earthquakes rattle ماشين (Colombia) (station CIMA), Sotara (station SOSO), and Galeras (along with rockfall and gas emission events there) (station CUVZ) volcanoes today.

Small volcanic (?) earthquakes continue at كوتوباكسي (Ecuador) (station CO1V). Similar small earthquakes have become apparent again on seismograms at التبخير volcano (station RETU). Co-eruptive(?) seismicity rumbles beneath/within Reventador volcano (station CONE) as well.

أبيض جزيرة volcano (New Zealand) continue to be afflicted with unsteady volcanic tremor today.

whiteislandcraterfloor_20130423

OMI البيانات الساتلية were not updated again today. A single volcano (Tolbachik) was detected by MODIS satellite sensors during recent global transits.

الكلام عقلك

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