النشاط بركان 11 سبتمبر، 2012 - الزلزالية القوية في Sitkin ليتل (ألاسكا) + البراكين نشاط آخر في جميع أنحاء العالم

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

11 سبتمبر، 2012 النشاط البركان

A little more volcanic activity (mostly internal) to report today.

In Alaska, يذكر Sitkin volcano continues to rumble with earthquakes (mostly hidden in the noise caused by passage of an Aleutian low pressure system). (station LSSA)

تحديث : A significant burst of seismicity has just begun at Little Sitkin volcano. I have a strong feeling that this volcano intends to erupt!

صورة مجاملة مرصد البراكين في ألاسكا

Seismogram just before writing the update

A seismic station located near Mount Martin also shows increased seismicity in the Katmai volcanoes over the past day (not pictured).

A swarm of volcano-tectonic earthquakes appears underway at البركان volcano (Mexico). The local earthquake there yesterday (at very top of record) was a magnitude M1.3, not as I poorly guessed, an M3.0. The repeating signatures after 2230 UTC are due to technical issues, not on-going seismicity.

Another outburst is visible on seismograms at فويغو volcano (Guatemala) (station FG3) this morning, while seismograms recorded at nearby سانتا ماريا show continuous, strong degassing tremor and occasional explosions (station STG6).

In El Salvador, سان ميغيل volcano seems to be building to another seismic crescendo (station VSM). This somewhat "normal" behaviour for the volcano usually takes place over a period of several weeks to months time. Seismicity builds from low levels to nearly continuous strong tremor, often interspersed with felt events near its culmination. Little surface activity occurs in conjunction with each crisis, other than small, intra-crater rockfalls and increased outgassing. The volcano then slowly (again, weeks to months) returns to its relatively docile state.

Nicaraguan volcanoes, Telica (station TELN), سان كريستوبال (station CRIN) and Apoyeque (station APYN) all show little change in behavior from the past few days with volcanic earthquakes and tremor at the former two vents and apparent tiny, repeating earthquakes at Apoyeque. Note the apparent increase in low-level tremor at San Cristobal following a regional earthquake, suggestive of continued internal instability at the volcano.

Things appear to be quieting at our two Colombian "regular performer" volcanoes, نيفادو ديل رويز (station OLLZ) and Galeras، في حين ماشين volcano (station CIMA) seems to be picking up the slack with a second burst of earthquakes in as many days. And just as things appeared to be calming down at Sotara (station SOSO) volcano, it has rejuvenated with another earthquake swarm overnight. Neither of the latter volcanoes has experienced historical activity.

Volcanic earthquakes and low-level tremor are visible on seismograms at التبخير volcano (Ecuador (station RETU) today, despite technical difficulties with webicorders there.

Continuous volcanic tremor plagues أبيض جزيرة (New Zealand) again today and small local earthquakes and perhaps low level tremor (or wind?) are visible on seismograms at Ruapehu (station fwvz).

النشاط الزلزالي في شرم هييرو is increasing strongly today and is up and down the last couple of weeks.

Lava flows did arrive in the proximity of a few villages on the slopes of Karangetang بركان، إندونيسيا. All inhabitants have been evacuated to safer locations.

نشاط لوحظ من قبل الأقمار الصناعية
Recent satellite imagery show SO2 plume activity remains strong at نيفادو ديل رويز, كيلاوي (HI) and Sakurajima (Japan) volcanoes over the past few days.