The INGV OE announces that on Monday 23/05/2022, the inhabitants of Vulcano Porto reported the appearance of a milky white color distributed over the entire strip of sea in front of Levante beach in Vulcano.
Vulcano - location of the Porto Levante area - Doc. Springer Nature - Bonadonna, C & al. - one click to enlarge
Investigations by witnesses on the site showed that the phenomenology had started on 05.22.2022 with the appearance of blackish and foul-smelling waters in the arm of the sea in question. The phenomenon, observed thanks to the video surveillance placed at the Observatory of Lipari, seems to have reached its peak around 1:00 p.m. local time today, while in the last hours it seemed to be in sharp decline.
The duration and extent of the event, along with the appearance of dark fluids followed by the diffuse milky color, suggests that an impulsive outgassing event affected the exhalation zone overlooking Levante Beach. A phenomenon of release of fluids due to an increase in pressure in the hydrothermal system can indeed cause the emission of water rich in sulphides, present in the shallowest part of the system itself, therefore with typical dark colors. The subsequent oxidation causes the formation of elemental sulfur and the subsequent massive flocculation of it, producing the milky white appearance of seawater. The impulsive dynamics of outgassing also cause pre-existing deposits of native sulfur, contributing to reinforce the phenomenon in question.
From yesterday May 22, there has been a steady increase in the number of low frequency events (VLP; spectral peak below 1 Hz) compared to that recorded over the past 2 months. ground deformations, no significant changes have been recorded in recent days at the GNSS and Tilt stations.
An inspection will be carried out by INGV researchers using the Institute's nautical vehicle, for macroscopic observations of the phenomenon, field measurements and samples.
Source: INGV OE - COMUNICATO DI ATTIVITA' VULCANICA del 2022-05-23 18:31:31(UTC) - VULCANO
Vulcano - bubbles in a puddle in the Porto Levante area - photo archives © Bernard Duyck - one click to enlarge
About 400 earthquakes have been measured with the Icelandic Meteorological Bureau's automatic tracking system in the past 24 hours on the Reykjanes Peninsula.
On May 23 at 07:15, a magnitude 3.5 earthquake was measured about 3 km northeast of Þorbjörn. It was felt on the Reykjanes peninsula and in the capital region. Last night, May 22 at 11:13 p.m., a magnitude 3.0 earthquake shook the area.
The hypocenter is at a depth between 4.5 and 5.8 km from the surface.
A new InSar has been published by the IMO ! It confirms a sill intrusion and a deformation of 4-4.5 cm. based on interferometry performed between April 27, 2022 and May 21, 2022.
Landslides can occur on the slopes and sides of mountains when earthquakes of these magnitudes occur. Caution is advised for people in these areas.
Reykjanes Peninsula - the Sentintel-1 interferogram from April 27 to May 21, 2022. - inflation of 40-45 mm - Doc. IMO / V. Drouin
The Óróapúls site has added a new webcam, with from Þorbjörn a panoramic view of the now active area of Reykjanes. Click on the link for a full page view: https://oroapuls.com/webcams
Source: IMO & Óróapúls