Thanks to the monitoring systems of the Popocatépetl volcano, 386 exhalations and 296 minutes of tremor were identified, some of these events were accompanied by the emission of gases and light quantities of ash which dispersed on 14.02 towards the east and the 15.02 towards the northwest
In addition, three explosions were recorded. The first of the moderate type yesterday at 10:31 p.m. even expelled incandescent fragments by the east and north slopes, accompanied by a column of 1200 m high. Subsequently, two minor explosions were recorded on February 15 at 07:12 and 09:32 respectively.
During the morning and at the time of this report, there has been a sequence of low ash exhalations which average 1200 m high and head west.
The activity remains under the Amarillo Fase 2 alert, along with a 12 km prohibited area.
Sources: Cenapred and wencamsdeMexico
The OVPF reports in its bulletin of February 15 at 3:30 p.m. a rapid fall in the volcanic tremor recorded from 2 p.m. local time at Piton de La Fournaise. However, since 2:20 p.m., it continues to record a residual volcanic tremor at the 2 seismic stations closest to the eruptive site.
Given the adverse weather conditions on site, no visual observation could be made. Consequently, at the present time it is impossible to confirm or not the cessation of the eruptive activity of Piton de la Fournaise.
Piton de La Fournaise - Evolution of the RSAM (indicator of the volcanic tremor and the intensity of the eruption) between 02/10/2020 and 02/15/2020 3.30 p.m. local time (11.30 a.m. UT) on the DSO seismological station at the top of the volcano. (© OVPF / IPGP)
Piton de La Fournaise - Spectrogram showing the evolution of the spectrum of the seismic signal (indicator of the volcanic tremor and the intensity of the eruption) between 02/10/2020 and 02/15/2020 3.30 p.m. local time (11.30 a.m. UT ) on the DSO seismological station located at the top of the volcano. (© OVPF / IPGP)
Aerial observations on the morning of February 16 by helicopter company pilots report that no more surface activity was visible around 7:30 am to 8:00 am local time at the eruptive site.
However, a residual tremor, the intensity of which has increased since around 4:40 local time, is still recorded at the seismological stations closest to the eruption, as well as degassing, meaning that there is still magma close to the surface at the level of the eruptive site. Thus, no hypothesis is ruled out as to the evolution of the situation to come (final cessation, resumption of surface activity on the same site, resumption of activity on another site).
Find all the information relating to the activity of Piton de la Fournaise on the various media of the OVPF-IPGP:
- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- the Twitter account (https://twitter.com/obsfournaise?lang=fr),
- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)
Piton de La Fournaise - Spectrogram showing the evolution of the spectrum of the seismic signal (indicator of the volcanic tremor and the intensity of the eruption) between 04h and 08h local (00h and 04h UTC) on 16.02.2020 on the seismic station DSO located at the top of the volcano. (© OVPF / IPGP)
AVO raised the alert level of Semisopochnoi, in the Aleutian arc, to WATCH this February 15 at 12:19 p.m. AKST following an increase in its activity, characterized by a series of small explosions and earthquakes.
Tremor puffs last 3 to 12 minutes every hour
As low-level ash emissions can accompany these explosions, and be masked by cloud cover between 1,500 and 4,500 meters, the aviation code has changed from Yellow to ORANGE.
Source: Alaska Volcano Observatory