Earthquake with magnitude of ML 2.2 on date 24-01-2021 and time 09:34:13 (Italy) in region 1 km SW Sant'Alfio (CT)

A magnitude ML 2.2 earthquake occured in region: 1 km SW Sant'Alfio (CT), on

  • 24-01-2021 08:34:13 (UTC)
  • 24-01-2021 09:34:13 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7380, 15.1320 at 20 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 2 1087 2669
Giarre CT 5 27659 30328
Zafferana Etnea CT 5 9517 39845
Santa Venerina CT 6 8592 48437
Mascali CT 6 14282 62719
Riposto CT 6 14838 77557
Piedimonte Etneo CT 9 3963 81520
Fiumefreddo di Sicilia CT 9 9623 91143
Linguaglossa CT 12 5403 96546
Calatabiano CT 13 5308 101854
Trecastagni CT 14 10910 112764
Acireale CT 14 52622 165386
Viagrande CT 14 8563 173949
Aci Sant'Antonio CT 15 17984 191933
Pedara CT 15 14102 206035
Aci Catena CT 15 29851 235886
Aci Bonaccorsi CT 16 3524 239410
Gaggi ME 16 3184 242594
Castiglione di Sicilia CT 16 3215 245809
Nicolosi CT 16 7463 253272
Giardini-Naxos ME 17 9415 262687
Valverde CT 18 7840 270527
San Giovanni la Punta CT 18 23060 293587
Motta Camastra ME 18 845 294432
Francavilla di Sicilia ME 18 3945 298377
Taormina ME 19 10960 309337
Tremestieri Etneo CT 19 20589 329926
Castelmola ME 19 1088 331014
San Gregorio di Catania CT 19 11966 342980
Graniti ME 19 1492 344472
Mascalucia CT 19 31958 376430
Moio Alcantara ME 19 717 377147

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)
77 Km N of Siracusa (122291 inhabitants)
97 Km NE of Ragusa (73313 inhabitants)
98 Km E of Caltanissetta (63360 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 2.2 2021-01-24
08:34:13
37.7377 15.1315 20 2021-07-12
16:55:09
Bollettino Sismico Italiano INGV 89798301
Reviewed
Rev200
ML 1.8 2021-01-24
08:34:13
37.753 15.115 12 2021-05-05
13:17:08
Sala Operativa INGV_OE (Catania) 86523321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-24 08:34:13 ± 0.14
Latitude 37.7377 ± 0.0054
Longitude 15.1315 ± 0.0136
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89798301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1168
Semi-minor axis of confidence ellipse (meter) 383
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 286
Circular confidence region, given by single value of horizontal uncertainty (meter) 1170.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.01799
Epicentral distance of station farthest from the epicenter (degree) 0.77791
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 13
Type of magnitude ML
Reference to an origin 89798301
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-05 13:16:45

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 86523321
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-01-24 08:58:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-01-24T08:34:39.70 0.6 undecidable manual S 181 0.7779 97 0.83 34
IV.SSY.HHZ. 2021-01-24T08:34:33.63 0.6 undecidable manual S 185 0.5819 100 0.51 41
IV.HAGA.HHZ. 2021-01-24T08:34:29.41 0.6 undecidable manual S 178 0.4524 104 0.03 47
IV.HAVL.HHZ. 2021-01-24T08:34:27.78 0.3 undecidable manual P 181 0.7779 97 -0.25 64
IV.SSY.HHZ. 2021-01-24T08:34:24.65 0.3 undecidable manual P 185 0.5819 100 -0.05 69
IV.HAGA.HHZ. 2021-01-24T08:34:22.20 0.3 undecidable manual P 178 0.4524 104 -0.35 67
IV.HLNI.HHZ. 2021-01-24T08:34:22.02 0.3 undecidable manual P 208 0.4398 104 -0.32 67
IV.ENIC.HHZ. 2021-01-24T08:34:21.41 0.6 undecidable manual S 219 0.1376 137 0.36 47
IV.ECTS.HHZ. 2021-01-24T08:34:21.46 0.6 undecidable manual S 357 0.1448 136 0.26 49
IV.EFIU.HHE. 2021-01-24T08:34:20.06 0.6 undecidable manual S 50 0.0809 152 -0.03 51
IV.ESPC.HHN. 2021-01-24T08:34:19.91 0.6 undecidable manual S 241 0.0935 149 -0.36 47
IV.EMFO.HHE. 2021-01-24T08:34:19.75 0.6 undecidable manual S 266 0.0324 168 0.15 51
IV.AIO.HHZ. 2021-01-24T08:34:19.47 0.1 undecidable manual P 19 0.2464 118 0.24 95
IV.EVRN.HHZ. 2021-01-24T08:34:19.59 0.6 undecidable manual S 176 0.0486 163 -0.13 50
IV.ESAL.HHE. 2021-01-24T08:34:19.60 0.6 undecidable manual S 8 0.0180 174 0.07 52
IV.ENIC.HHZ. 2021-01-24T08:34:18.18 0.3 undecidable manual P 219 0.1376 137 0.44 70
IV.ECTS.HHZ. 2021-01-24T08:34:17.92 0.3 undecidable manual P 357 0.1448 136 0.1 75
IV.ESPC.HHN. 2021-01-24T08:34:17.14 0.1 undecidable manual P 241 0.0935 149 -0.15 99
IV.EPOZ.HHZ. 2021-01-24T08:34:17.00 0.3 undecidable manual P 146 0.0800 153 -0.17 74
IV.EPIT.HHN. 2021-01-24T08:34:17.67 0.3 undecidable manual P 321 0.0944 149 0.38 72
IV.ECBD.HHN. 2021-01-24T08:34:17.06 0.3 undecidable manual P 320 0.0558 161 0.05 77
IV.EVRN.HHZ. 2021-01-24T08:34:16.80 0.1 undecidable manual P 176 0.0486 163 -0.17 99
IV.EFIU.HHE. 2021-01-24T08:34:16.83 0.3 undecidable manual P 50 0.0809 152 -0.35 71
IV.ESAL.HHE. 2021-01-24T08:34:16.71 0.1 undecidable manual P 8 0.0180 174 -0.15 100
IV.EMFO.HHE. 2021-01-24T08:34:16.80 0.3 undecidable manual P 266 0.0324 168 -0.1 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EVRN.HHN. ML:2.4 0.002036048 0.16 AML other m 2021-01-24T08:34:19.77
IV.EVRN.HNN. ML:2.5 0.002765 0.26 AML other m 2021-01-24T08:34:19.77
IV.EVRN.HNE. ML:2.5 0.0023033859999999997 0.1984 AML other m 2021-01-24T08:34:19.90
IV.EVRN.HHE. ML:2.6 0.0030301679999999998 0.224 AML other m 2021-01-24T08:34:19.90
IV.ECTS.HHE. ML:1.9 0.00046939074999999996 0.384 AML other m 2021-01-24T08:34:22.08
IV.ECTS.HHN. ML:1.8 0.00036816969999999997 0.3008 AML other m 2021-01-24T08:34:22.38
IV.ENIC.HHE. ML:2.1 0.00086710115 0.2624 AML other m 2021-01-24T08:34:24.36
IV.ENIC.HHN. ML:2.1 0.00084005745 0.5056 AML other m 2021-01-24T08:34:29.46
IV.ENIC.HNE. ML:2.3 0.0014162415500000001 0.4288 AML other m 2021-01-24T08:34:23.02
IV.AIO.HHN. ML:1.4 0.00010161810000000001 0.3392 AML other m 2021-01-24T08:34:28.70
IV.AIO.HHE. ML:1.3 0.00008674253999999999 0.1792 AML other m 2021-01-24T08:34:25.30
IV.SSY.HHN. ML:2.3 0.00035793874999999996 0.16 AML other m 2021-01-24T08:34:38.60
IV.HAVL.HHN. ML:2.0 0.00011403549000000001 0.3392 AML other m 2021-01-24T08:34:39.89
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download