Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 25-09-2021 and time 09:53:23 (Italy) in region 4 km SW Santa Venerina (CT)

A magnitude ML 1.9 earthquake occured in region: 4 km SW Santa Venerina (CT), on

  • 25-09-2021 07:53:23 (UTC)
  • 25-09-2021 09:53:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.6590, 15.1150 at 4 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
Santa Venerina CT 4 8592 8592
Zafferana Etnea CT 4 9517 18109
Trecastagni CT 6 10910 29019
Viagrande CT 6 8563 37582
Aci Sant'Antonio CT 6 17984 55566
Pedara CT 7 14102 69668
Aci Catena CT 7 29851 99519
Aci Bonaccorsi CT 7 3524 103043
Acireale CT 7 52622 155665
Milo CT 7 1087 156752
Valverde CT 9 7840 164592
San Giovanni la Punta CT 9 23060 187652
Nicolosi CT 9 7463 195115
Tremestieri Etneo CT 10 20589 215704
Sant'Alfio CT 10 1582 217286
Giarre CT 10 27659 244945
San Gregorio di Catania CT 10 11966 256911
Mascalucia CT 11 31958 288869
Sant'Agata li Battiati CT 11 9479 298348
Riposto CT 11 14838 313186
Aci Castello CT 12 18723 331909
Gravina di Catania CT 12 25838 357747
San Pietro Clarenza CT 12 7743 365490
Mascali CT 13 14282 379772
Camporotondo Etneo CT 14 5023 384795
Belpasso CT 14 28108 412903
Ragalna CT 16 3924 416827
Fiumefreddo di Sicilia CT 17 9623 426450
Catania CT 17 314555 741005
Piedimonte Etneo CT 18 3963 744968
Misterbianco CT 18 49410 794378

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km NW of Acireale (52622 inhabitants)
17 Km N of Catania (314555 inhabitants)
68 Km N of Siracusa (122291 inhabitants)
68 Km SW of Reggio di Calabria (183035 inhabitants)
71 Km SW of Messina (238439 inhabitants)
88 Km NE of Ragusa (73313 inhabitants)
94 Km NE of Vittoria (63339 inhabitants)
94 Km NE of Modica (54633 inhabitants)
95 Km E of Caltanissetta (63360 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 1.9 2021-09-25
07:53:23		 37.6587 15.1153 4 2022-03-30
13:04:39		 Bollettino Sismico Italiano INGV 101364461
Reviewed
Rev200 		ML 1.5 2021-09-25
07:53:23		 37.675 15.093 2 2022-02-23
07:30:31		 Sala Operativa INGV_OE (Catania) 95863001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-25 07:53:23 ± 0.24
Latitude 37.6587 ± 0.0099
Longitude 15.1153 ± 0.0068
Depth (km) 4 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101364461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1046
Semi-minor axis of confidence ellipse (meter) 336
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 177
Circular confidence region, given by single value of horizontal uncertainty (meter) 1050.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.03417
Epicentral distance of station farthest from the epicenter (degree) 0.20864
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 101364461
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-23 07:30:17

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 95863001
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-09-25 08:00:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EMCN.HHN. 2021-09-25T07:53:29.85 0.6 undecidable manual S 334 16.3725 103 0.16 48
IV.EPDN.HHZ. 2021-09-25T07:53:29.48 0.6 undecidable manual S 324 14.6742 105 0.35 46
IV.EPOZ.HHZ. 2021-09-25T07:53:28.08 0.6 undecidable manual S 77 6.5934 121 1.57 27
IV.EMSG.HHZ. 2021-09-25T07:53:28.89 0.3 undecidable manual P 321 23.1546 100 0.34 69
IV.EMPL.HHZ. 2021-09-25T07:53:28.76 0.6 undecidable manual S 280 12.9759 107 0.22 48
IV.ESLN.HHZ. 2021-09-25T07:53:28.69 0.6 undecidable manual S 287 12.9759 107 0.14 49
IV.EMFO.HHE. 2021-09-25T07:53:27.27 0.6 undecidable manual S 346 8.7801 114 0.07 50
IV.EMCN.HHN. 2021-09-25T07:53:27.02 0.1 undecidable manual P 334 16.3725 103 -0.2 95
IV.ESPC.HHN. 2021-09-25T07:53:27.45 0.6 undecidable manual S 296 8.5803 114 0.32 47
IV.EPIT.HHZ. 2021-09-25T07:53:27.93 0.3 undecidable manual P 343 17.6712 102 0.45 68
IV.EPDN.HHZ. 2021-09-25T07:53:26.77 0.1 undecidable manual P 324 14.6742 105 -0.13 97
IV.ESAL.HHZ. 2021-09-25T07:53:26.10 0.3 undecidable manual P 9 10.7781 110 -0.06 74
IV.ESLN.HHZ. 2021-09-25T07:53:26.42 0.1 undecidable manual P 287 12.9759 107 -0.14 97
IV.ECBD.HHN. 2021-09-25T07:53:26.64 0.1 undecidable manual P 349 13.6752 106 -0.07 99
IV.EMPL.HHZ. 2021-09-25T07:53:26.50 0.3 undecidable manual P 280 12.9759 107 -0.06 74
IV.EVRN.HNZ. 2021-09-25T07:53:25.52 0.3 undecidable manual S 28 3.7962 136 -0.23 73
IV.EPOZ.HHZ. 2021-09-25T07:53:25.45 0.1 positive manual P 77 6.5934 121 0.06 100
IV.EMFO.HHE. 2021-09-25T07:53:25.47 0.1 undecidable manual P 346 8.7801 114 -0.32 94
IV.ESPC.HHN. 2021-09-25T07:53:25.61 0.1 undecidable manual P 296 8.5803 114 -0.13 98
IV.EVRN.HNZ. 2021-09-25T07:53:24.53 0.1 undecidable manual P 28 3.7962 136 -0.42 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESAL.HHN. ML:1.7 0.000772 0.8 AML other m 2021-09-25T07:53:31.68
IV.EMPL.HHN. ML:2.1 0.0018700000000000001 0.16 AML other m 2021-09-25T07:53:31.73
IV.ESAL.HHE. ML:1.8 0.0009205 1.26 AML other m 2021-09-25T07:53:31.77
IV.EMPL.HHE. ML:1.9 0.00118 0.92 AML other m 2021-09-25T07:53:34.96
IV.EPIT.HHE. ML:2.0 0.000911 0.96 AML other m 2021-09-25T07:53:40.34
IV.EPIT.HHN. ML:1.9 0.0007840000000000001 0.34 AML other m 2021-09-25T07:53:40.30
IV.EMSG.HHE. ML:1.9 0.0005465 0.8 AML other m 2021-09-25T07:53:43.50
IV.EMSG.HHN. ML:1.8 0.0004125 1.14 AML other m 2021-09-25T07:53:44.01
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