Earthquake with magnitude of ML 1.1 on date 22-10-2021 and time 02:14:18 (Italy) in region 1 km S Sant'Alfio (CT)

A magnitude ML 1.1 earthquake occured in region: 1 km S Sant'Alfio (CT), on

  • 22-10-2021 00:14:18 (UTC)
  • 22-10-2021 02:14:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.736, 15.142 at 8 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
Milo CT 3 1087 2669
Giarre CT 4 27659 30328
Santa Venerina CT 5 8592 38920
Mascali CT 5 14282 53202
Riposto CT 6 14838 68040
Zafferana Etnea CT 6 9517 77557
Piedimonte Etneo CT 9 3963 81520
Fiumefreddo di Sicilia CT 9 9623 91143
Linguaglossa CT 12 5403 96546
Calatabiano CT 12 5308 101854
Acireale CT 14 52622 154476
Trecastagni CT 14 10910 165386
Viagrande CT 14 8563 173949
Aci Sant'Antonio CT 14 17984 191933
Aci Catena CT 15 29851 221784
Pedara CT 15 14102 235886
Aci Bonaccorsi CT 16 3524 239410
Gaggi ME 16 3184 242594
Castiglione di Sicilia CT 17 3215 245809
Giardini-Naxos ME 17 9415 255224
Nicolosi CT 17 7463 262687
Valverde CT 17 7840 270527
Taormina ME 18 10960 281487
San Giovanni la Punta CT 18 23060 304547
Castelmola ME 18 1088 305635
Motta Camastra ME 18 845 306480
Francavilla di Sicilia ME 19 3945 310425
Tremestieri Etneo CT 19 20589 331014
Graniti ME 19 1492 332506
San Gregorio di Catania CT 19 11966 344472
Mascalucia CT 20 31958 376430
Aci Castello CT 20 18723 395153
Moio Alcantara ME 20 717 395870

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km N of Acireale (52622 inhabitants)
26 Km N of Catania (314555 inhabitants)
61 Km SW of Reggio di Calabria (183035 inhabitants)
63 Km SW of Messina (238439 inhabitants)
76 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
99 Km E of Caltanissetta (63360 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.1 2021-10-22
00:14:18
37.736 15.142 8 2021-10-22
00:22:51
Sala Operativa INGV_OE (Catania) 96861101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-22 00:14:18
Latitude 37.7360
Longitude 15.1420
Depth (km) 8 (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 96861101

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) 300
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 105
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) 0.2
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:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 96861101
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-10-22 00:22:51
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download