Earthquake with magnitude of ML 1.8 on date 25-01-2021 and time 03:20:20 (Italy) in region 1 km E Sant'Alfio (CT)

A magnitude ML 1.8 earthquake occured in region: 1 km E Sant'Alfio (CT), on

  • 25-01-2021 02:20:20 (UTC)
  • 25-01-2021 03:20:20 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.75, 15.16 at 11 km depth.

The earthquake was located by: Sala Operativa INGV_OE (Catania).

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Sant'Alfio CT 1 1582 1582
Giarre CT 3 27659 29241
Mascali CT 3 14282 43523
Riposto CT 4 14838 58361
Milo CT 5 1087 59448
Fiumefreddo di Sicilia CT 7 9623 69071
Piedimonte Etneo CT 7 3963 73034
Santa Venerina CT 7 8592 81626
Zafferana Etnea CT 8 9517 91143
Calatabiano CT 10 5308 96451
Linguaglossa CT 10 5403 101854
Gaggi ME 14 3184 105038
Giardini-Naxos ME 15 9415 114453
Acireale CT 15 52622 167075
Castiglione di Sicilia CT 15 3215 170290
Taormina ME 16 10960 181250
Castelmola ME 16 1088 182338
Aci Sant'Antonio CT 16 17984 200322
Aci Catena CT 16 29851 230173
Viagrande CT 16 8563 238736
Trecastagni CT 16 10910 249646
Motta Camastra ME 16 845 250491
Graniti ME 17 1492 251983
Pedara CT 17 14102 266085
Francavilla di Sicilia ME 17 3945 270030
Aci Bonaccorsi CT 17 3524 273554
Nicolosi CT 19 7463 281017
Valverde CT 19 7840 288857
Moio Alcantara ME 19 717 289574
Letojanni ME 20 2861 292435
San Giovanni la Punta CT 20 23060 315495

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km N of Acireale (52622 inhabitants)
28 Km N of Catania (314555 inhabitants)
58 Km SW of Reggio di Calabria (183035 inhabitants)
61 Km SW of Messina (238439 inhabitants)
78 Km N of Siracusa (122291 inhabitants)
99 Km NE of Ragusa (73313 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev200
ML 1.8 2021-01-25
02:20:20
37.75 15.16 11 2021-01-25
04:05:07
Sala Operativa INGV_OE (Catania) 86549661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-25 02:20:20
Latitude 37.75
Longitude 15.16
Depth (km) 11 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 200 -> SURVEY-INGV-CT#SeismPicker_SO-OE
Event type earthquake
Origin ID 86549661

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 700
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 1
Number of defining phases 1
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree)
Epicentral distance of station farthest from the epicenter (degree)
Number of stations at which the event was observed 0
Number of stations from which data was used for origin computation 0
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 86549661
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-01-25 04:05:07
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download