Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 25-10-2021 and time 13:23:49 (Italy) in region 1 km NW Calatabiano (CT)

A magnitude ML 1.7 earthquake occured in region: 1 km NW Calatabiano (CT), on

  • 25-10-2021 11:23:49 (UTC)
  • 25-10-2021 13:23:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8320, 15.2160 at 11 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Calatabiano CT 1 5308 5308
Gaggi ME 3 3184 8492
Piedimonte Etneo CT 4 3963 12455
Fiumefreddo di Sicilia CT 4 9623 22078
Giardini-Naxos ME 6 9415 31493
Castelmola ME 6 1088 32581
Taormina ME 6 10960 43541
Linguaglossa CT 6 5403 48944
Graniti ME 7 1492 50436
Motta Camastra ME 8 845 51281
Mascali CT 8 14282 65563
Mongiuffi Melia ME 10 600 66163
Letojanni ME 10 2861 69024
Castiglione di Sicilia CT 10 3215 72239
Gallodoro ME 10 367 72606
Francavilla di Sicilia ME 11 3945 76551
Riposto CT 11 14838 91389
Sant'Alfio CT 12 1582 92971
Giarre CT 12 27659 120630
Roccafiorita ME 12 197 120827
Limina ME 13 836 121663
Forza d'Agrò ME 14 911 122574
Milo CT 15 1087 123661
Sant'Alessio Siculo ME 15 1554 125215
Moio Alcantara ME 16 717 125932
Antillo ME 16 919 126851
Casalvecchio Siculo ME 17 842 127693
Malvagna ME 17 733 128426
Santa Venerina CT 17 8592 137018
Fondachelli-Fantina ME 18 1019 138037
Savoca ME 18 1732 139769
Zafferana Etnea CT 18 9517 149286
Santa Teresa di Riva ME 19 9377 158663

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km N of Acireale (52622 inhabitants)
38 Km N of Catania (314555 inhabitants)
49 Km SW of Reggio di Calabria (183035 inhabitants)
50 Km SW of Messina (238439 inhabitants)
86 Km N of Siracusa (122291 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.7 2021-10-25
11:23:49		 37.8322 15.2163 11 2022-03-30
13:04:14		 Bollettino Sismico Italiano INGV 97167291
Reviewed
Rev200 		ML 1.6 2021-10-25
11:23:48		 37.819 15.198 13 2022-02-16
16:39:59		 Sala Operativa INGV_OE (Catania) 96979171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 11:23:49 ± 0.11
Latitude 37.8322 ± 0.0036
Longitude 15.2163 ± 0.0080
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97167291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 656
Semi-minor axis of confidence ellipse (meter) 373
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 167
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34264
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.1
Num. used stations 7
Type of magnitude ML
Reference to an origin 97167291
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-02 12:41:39

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations
Type of magnitude ML
Reference to an origin 96979171
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-10-25 11:30:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MPNC.HHZ. 2021-10-25T11:24:02.64 0.6 undecidable manual S 19 36.8298 50 0.55 42
IV.MUCR.HHZ. 2021-10-25T11:24:02.61 0.6 undecidable manual S 308 38.0286 50 0.2 46
IV.ECHR.HHZ. 2021-10-25T11:23:57.54 3.0 undecidable manual P 0
IV.EPOZ.HHZ. 2021-10-25T11:23:57.30 0.3 undecidable manual S 188 17.9709 121 0.32 69
IV.EMNR.HHE. 2021-10-25T11:23:57.22 0.6 undecidable manual S 264 16.7721 123 0.59 44
IV.EMFO.HHE. 2021-10-25T11:23:56.11 0.3 undecidable manual S 226 15.3735 125 -0.12 73
IV.MUCR.HHZ. 2021-10-25T11:23:56.86 0.3 undecidable manual P 308 38.0286 50 -0.19 70
IV.EPIT.HHZ. 2021-10-25T11:23:56.55 0.3 undecidable manual S 261 14.1747 127 0.66 66
IV.AIO.HHZ. 2021-10-25T11:23:56.83 0.3 undecidable manual S 5 15.4734 125 0.57 68
IV.MPNC.HHZ. 2021-10-25T11:23:56.72 0.3 undecidable manual P 19 36.8298 50 -0.15 71
IV.EPZF.HHZ. 2021-10-25T11:23:55.95 0.6 undecidable manual P 268 31.5462 50 -0.09 48
IV.ESAL.HHZ. 2021-10-25T11:23:55.33 0.3 undecidable manual S 220 11.1777 134 0.23 73
IV.EMPL.HHE. 2021-10-25T11:23:55.94 1.0 undecidable manual P 232 27.4503 50 0.52 21
IV.ECBD.HHE. 2021-10-25T11:23:55.84 0.3 undecidable manual S 243 12.7761 130 0.33 72
IV.EMSG.HHZ. 2021-10-25T11:23:54.93 0.6 undecidable manual P 267 23.3544 50 0.14 48
IV.ESPC.HHN. 2021-10-25T11:23:54.52 0.6 undecidable manual P 227 22.6551 50 -0.16 48
IV.EFIU.HHZ. 2021-10-25T11:23:54.32 0.3 undecidable manual S 186 4.7952 156 0.53 70
IV.ECTS.HHE. 2021-10-25T11:23:54.62 0.3 undecidable manual S 304 9.9789 137 -0.2 71
IV.NOV.HHE. 2021-10-25T11:23:54.62 0.6 undecidable manual P 342 22.755 50 -0.08 49
IV.AIO.HHZ. 2021-10-25T11:23:53.53 0.1 undecidable manual P 5 15.4734 125 0.03 100
IV.EPOZ.HHZ. 2021-10-25T11:23:53.84 0.3 undecidable manual P 188 17.9709 121 -0.07 74
IV.EMNR.HHE. 2021-10-25T11:23:53.54 0.3 undecidable manual P 264 16.7721 123 -0.17 72
IV.EMFO.HHE. 2021-10-25T11:23:53.04 0.3 undecidable manual P 226 15.3735 125 -0.44 68
IV.EVRN.HHE. 2021-10-25T11:23:53.57 1.0 undecidable manual P 204 17.3715 122 -0.24 24
IV.EPIT.HHZ. 2021-10-25T11:23:53.13 0.3 undecidable manual P 261 14.1747 127 -0.16 72
IV.ESAL.HHZ. 2021-10-25T11:23:52.56 0.3 undecidable manual P 220 11.1777 134 -0.27 71
IV.ECBD.HHE. 2021-10-25T11:23:52.79 0.3 undecidable manual P 243 12.7761 130 -0.27 71
IV.ECTS.HHE. 2021-10-25T11:23:52.33 0.1 undecidable manual P 304 9.9789 137 -0.34 93
IV.EFIU.HHZ. 2021-10-25T11:23:51.89 0.1 undecidable manual P 186 4.7952 156 -0.18 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESAL.HHN. ML:1.8 0.0006655443999999999 1.68 AML other m 2021-10-25T11:23:59.86
IV.ESAL.HHE. ML:1.8 0.00081414645 0.2048 AML other m 2021-10-25T11:23:59.22
IV.EPOZ.HHE. ML:1.7 0.00043153891 0.5184 AML other m 2021-10-25T11:24:00.30
IV.MUCR.HHN. ML:1.6 0.00014218450999999997 0.3584 AML other m 2021-10-25T11:24:03.12
IV.MUCR.HHE. ML:1.6 0.00014265 0.4 AML other m 2021-10-25T11:24:03.33
IV.EPOZ.HHN. ML:1.8 0.00045386579999999997 0.4864 AML other m 2021-10-25T11:24:03.61
IV.MPNC.HHN. ML:1.5 0.00012446107000000002 1.3984 AML other m 2021-10-25T11:24:04.90
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