EKPA Seismology Laboratory: Research of Seismic Process in Santorini

Detailed data used to be equipped through the seismology laboratory (s) of the NCSR at the seismic series that has lately been within the Cyclades.

The Seismology Laboratory of the Division of Geology and Geoenvironment of the NCSR is tracking in genuine time the evolution of seismic job within the Santorini volcanic complicated, in addition to within the Santorini – Amorgos zone, close to the islet of Andros. To observe real-time seismicity on this space, a distinct web page has been shaped at the Geophysical-Genestomy Sector’s website online, with an interactive map that mixes fresh earthquakes, seismological stations and energetic flicos within the learn about space: www.geophysics. geol.uoa.gr/stations/gmaps3/santorini_amorgos_zone.php.

What does the seismology laboratory analysis display

In June 2024, micro -seismic job started to appear inside the Santorini caldera, with small earthquake clusters present in July and August, whilst seismicity intensified since mid -September. That is the primary time for the reason that length 2011-2012 which displays important micro-seismic job inside the complicated. Within the construction of this series, the EKPA seismology laboratory put in everlasting seismological stations in Santorini since 2011. By contrast to Caldera, the world of ​​the submarine volcano Columbus, ~ 8 km Be of Santorini, seems through the years.

All through the seismic series of 2024, the micro-seismic-center in Santorini have been principally discovered within the New Kameni and wider space of ​​Imerovi-Fira, alongside the “Kameni Line” with Ba-ND. On the similar time, a micro-seismic job gave the impression within the space east of Columbus, which have been activated throughout the length 2011-2012. In overall, from June 2024 till January 25, 2025, greater than 1,600 earthquakes have been known with the usage of synthetic intelligence within the Santorini-Kolubo area (Determine 2), with a bigger person who passed off on January 25, 08:57:25 Greek time, Greece, Greece, Greece, That specialize in the na coasts of Thirasia, with measurement 3.8.

On January twenty sixth, a brand new team of earthquakes east of the Columbus volcano gave the impression, with a powerful upward thrust the next day to come. By means of January 29, greater than 1,300 earthquakes have been known on this space the use of synthetic intelligence, opting for strictly standards for making sure the standard of the effects. Greater than 2,500 earthquakes have been known from 26 till the tip of January 31, and from February 1, by which greater than 800 earthquakes have been detected, an abnormally prime earthquake productiveness started with greater than 4.0.

The seismicity regularly unfold to the northeast, within the space across the islet of Anhydrus. All through the length from February 2 to the early hours of February 5, 2025, the seismicity within the Santorini -Amorgos zone intensified even additional. The research of seismological information the use of synthetic intelligence till February 3 yielded a mess of over 1,300 earthquakes on 2 February and greater than 1,400 earthquakes on February 3.

The choice of earthquakes in measurement M≥2.5 is regularly higher consistent with day, with numerous 0, 1, 2, 6, 9, 25, 45, 340, and 474 earthquakes from January 26 to February 3. On February 2, 5 earthquakes with measurement M≥4.5, February 3, 7 earthquakes and February 4, 9 earthquakes. The scale of the biggest earthquake used to be 4.6 on February 2, whilst on February 3 and four, 3 earthquakes with sizes 4.9-5.0 and 4 others with measurement 4.8.

Map of earthquake distribution within the Cyclades space (Santorini-Amorgos-Ios) who have been known the use of synthetic intelligence throughout the length January 26-February 4, 2025. The focuses of earthquakes M³4.5 are marked with a celebrity. The coloring responds to the focal intensity, in line with the colour scale (proper). Supply:

On February 4, greater than 1,300 earthquakes have been recorded with M≥1.0 (relatively lower than February 3 recorded ~ 1,450 earthquakes with M≥1.0). The utmost measurement reached 4.9-5.0, with 21 earthquakes with sizes M≥4.0 and 9 earthquakes with Mular4.5. The distribution of seismic Endakers on February 4 used to be very similar to that of February 3, with maximum earthquakes being discovered close to anhydrous. The image become clearer against the tip of the day, when the point of interest used to be aligned to a ND-BA deal with within the southwest of Anhydros. A part of the job diffuses north of Anhydros with extra scattered center of attention. From January 26 till February 4, the choice of earthquakes detected exceeded 7,700 (Determine 3), of which greater than 6,100 have been in measurement M≥1.0 and over 1,200 have been in measurement M≥2.5.

The distribution of the seismic Edits on February 2 started concentrated in the course of the space of Anhydros-Santorini, after which migrated to NE to Anhydrus. On February 3, the seismicity remained principally amassed within the southwest of Anhydros, whilst small earthquake clusters additionally passed off in spaces west and north of Anhydros, typically lower than 10 km from it. All through February 1-February 4, the tip of the seismic activated zone seems emigrate to the northeast at a pace of ~ 4-5 km/day (km/day) in path of ~ B40 °. In step with the result of the mechanical finding out manner, throughout exacerbations, migration is finished at even upper speeds, masking shorter distances.

Map of earthquake distribution within the Cyclades space (Santorini – Amorgos – Ios) who have been known through synthetic intelligence strategies on February fifth 2025. Supply:

On February 5, the seismicity endured emigrate northeast at about the similar charge as the former days. Better earthquakes (m≥4.0) are discovered north of anhydrous, at focusing as much as ~ 6 km. On February 5, greater than 1,200 earthquakes have been recorded with a man-made intelligence manner (Determine 4), of which 741 with m≥1.0, whilst 19 earthquakes have been m³4.0, 4 earthquakes have been in measurement M³4.5 and the biggest earthquake used to be in measurement M = 5.1.

In step with the day-to-day seismic information research information of the seismology Lab Maximum earthquakes will have to be southwest of Anhydros, and a couple of northeast. Final days information display that, even though a lot of earthquakes with M³4.0 proceed to happen, the earthquake charge has a relative decline in earthquakes discovered each through standard strategies and with synthetic intelligence strategies.

The seismic flock

The seismic job up to now within the Santorini – Amorgos zone is almost definitely bearing the traits of a seismic flock, as there is not any earthquake obviously better than all others, which may well be described as the principle earthquake. As well as, the speed of seismicity through February 4 used to be expanding, whilst the publish -seismic sequences are characterised through a declining earthquake distribution, with the scale of the bigger aftershock in most cases lower than ~ 0.5 in comparison to the principle earthquake.

Despite the fact that it’s almost definitely a flock that incorporates massive earthquakes, in comparison to different fresh earthquake clusters in Greece, one is more likely to proceed its motion with regularly smaller sizes and a smaller multitude of earthquakes, however to take many months, as with regards to Seismic flocks of Thebes. The obvious end result of the job on February 3 and its slow decline through February sixth are on this path. Alternatively, a 2d risk, which can’t be dominated out, is this flock will stimulate the housebreaking of a good portion of a giant energetic rift within the space, thereby giving a major earthquake, after which the job takes the type of a standard publish -sequence. In this type of case, the seismic flock that has preceded the principle earthquake shall be described as (ex -post) as a pre -earthquake series.

Despite the fact that the seen seismic exacerbation happens inside the energetic volcanic arc of the South Aegean, it’s indirectly associated with a identified volcanic middle, however seems to have activated a gadget of standard ND-BA maritime control gadget. Seismic flocks, and particularly the ones inside of or close to volcanic environments, are incessantly stimulated through a fluid penetration into the Rhinemian tissue, which facilitate burglaries, coupled with the voltage transposition brought about through the tectonic earthquakes themselves.

The features of micro -dimensions are anticipated to strengthen, and the uncertainties of detecting the subdues shall be diminished within the coming days, as all establishments of the Unmarried Nationwide Seismographs Community are running to thicken the native stations. It’s famous that as a part of the extensive tracking of the present seismic job within the Santorini-Amorgos space, participants of the Seismology Laboratory in addition to the Geophysics Lab Santorini for the set up and upkeep of seismographs in addition to for soil deformation measurements.