Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 01-09-2021 and time 18:31:23 (Italy) in region 4 km W Bronte (CT)

A magnitude ML 1.8 earthquake occured in region: 4 km W Bronte (CT), on

  • 01-09-2021 16:31:23 (UTC)
  • 01-09-2021 18:31:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.7880, 14.7870 at 31 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
Bronte CT 4 19172 19172
Maletto CT 8 3920 23092
Maniace CT 9 3765 26857
Cesarò ME 9 2439 29296
San Teodoro ME 10 1403 30699
Adrano CT 15 36122 66821
Troina EN 16 9373 76194
Randazzo CT 17 10900 87094
Biancavilla CT 18 24007 111101
Centuripe EN 19 5470 116571
Regalbuto EN 20 7277 123848

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NW of Acireale (52622 inhabitants)
41 Km NW of Catania (314555 inhabitants)
72 Km E of Caltanissetta (63360 inhabitants)
81 Km SW of Messina (238439 inhabitants)
83 Km W of Reggio di Calabria (183035 inhabitants)
92 Km NW of Siracusa (122291 inhabitants)
93 Km NE of Gela (75827 inhabitants)
96 Km N of Vittoria (63339 inhabitants)
96 Km N of Ragusa (73313 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 1.8 2021-09-01
16:31:23		 37.7885 14.7872 31 2022-03-30
13:04:41		 Bollettino Sismico Italiano INGV 102054901
Reviewed
Rev200 		ML 1.3 2021-09-01
16:31:23		 37.745 14.732 19 2022-03-17
02:45:32		 Sala Operativa INGV_OE (Catania) 94925551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-01 16:31:23 ± 0.23
Latitude 37.7885 ± 0.0072
Longitude 14.7872 ± 0.0159
Depth (km) 31 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102054901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1130
Semi-minor axis of confidence ellipse (meter) 879
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.06565
Epicentral distance of station farthest from the epicenter (degree) 0.66999
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 102054901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-17 02:19:16

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 94925551
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-09-01 16:39:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSY.HHZ. 2021-09-01T16:31:46.45 0.6 undecidable manual S 160 74.37 107 0.19 43
IV.HVZN.HNZ. 2021-09-01T16:31:44.72 0.6 undecidable manual S 185 67.9764 109 0.09 45
IV.HLNI.HHZ. 2021-09-01T16:31:39.89 0.6 undecidable manual S 171 49.4172 117 -0.16 47
IV.MCPD.HHZ. 2021-09-01T16:31:37.42 0.6 undecidable manual S 352 37.1295 125 0.19 48
IV.SSY.HHZ. 2021-09-01T16:31:36.03 0.1 undecidable manual P 160 74.37 107 -0.45 83
IV.MSFR.HHZ. 2021-09-01T16:31:36.05 0.6 undecidable manual S 328 32.1456 129 -0.13 47
IV.CSLB.HHZ. 2021-09-01T16:31:36.08 0.3 undecidable manual P 285 65.9895 110 0.82 56
IV.MUCR.HHZ. 2021-09-01T16:31:35.46 0.6 undecidable manual S 15 29.2485 132 -0.13 48
IV.HVZN.HNZ. 2021-09-01T16:31:35.87 0.3 undecidable manual P 185 67.9764 109 0.32 65
IV.GALF.HHZ. 2021-09-01T16:31:34.36 0.6 undecidable manual S 246 21.1677 142 0.24 48
IV.EPZF.HHZ. 2021-09-01T16:31:32.93 0.6 undecidable manual S 57 7.2927 165 0.47 46
IV.ECZM.HHN. 2021-09-01T16:31:32.48 0.6 undecidable manual S 122 12.0768 157 -0.39 47
IV.HLNI.HHZ. 2021-09-01T16:31:32.20 0.1 undecidable manual P 171 49.4172 117 -0.7 80
IV.MCPD.HHZ. 2021-09-01T16:31:31.20 0.1 negative manual P 352 37.1295 125 -0.08 95
IV.EMPL.HHZ. 2021-09-01T16:31:30.27 0.3 undecidable manual P 127 20.1687 144 0.89 58
IV.MSFR.HHZ. 2021-09-01T16:31:30.32 0.1 undecidable manual P 328 32.1456 129 -0.35 90
IV.MUCR.HHZ. 2021-09-01T16:31:30.29 0.1 positive manual P 15 29.2485 132 -0.04 73
IV.EPIT.HHZ. 2021-09-01T16:31:30.46 0.6 undecidable manual P 84 23.754 139 0.73 62
IV.ECHR.HHE. 2021-09-01T16:31:29.35 0.3 undecidable manual P 136 15.7731 150 0.33 71
IV.GALF.HHZ. 2021-09-01T16:31:29.05 0.3 undecidable manual P 246 21.1677 142 -0.43 69
IV.EMSG.HHZ. 2021-09-01T16:31:29.01 0.1 undecidable manual P 76 14.6742 152 0.08 100
IV.EPZF.HHZ. 2021-09-01T16:31:28.17 0.3 undecidable manual P 57 7.2927 165 -0.34 72
IV.ECZM.HHN. 2021-09-01T16:31:28.55 0.1 undecidable manual P 122 12.0768 157 -0.21 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EPZF.HHN. ML:1.7 0.0002615 1.72 AML other m 2021-09-01T16:31:33.12
IV.EPZF.HHE. ML:1.6 0.00017649999999999998 0.4 AML other m 2021-09-01T16:31:34.44
IV.EMSG.HHN. ML:1.7 0.0002415 1.36 AML other m 2021-09-01T16:31:34.86
IV.MUCR.HHE. ML:1.5 0.00009759999999999999 1.06 AML other m 2021-09-01T16:31:35.33
IV.MUCR.HHN. ML:1.5 0.00011350000000000001 0.36 AML other m 2021-09-01T16:31:36.23
IV.GALF.HHN. ML:1.7 0.0001805 0.28 AML other m 2021-09-01T16:31:36.31
IV.GALF.HHE. ML:1.7 0.000203 1.6 AML other m 2021-09-01T16:31:36.02
IV.EMPL.HHN. ML:2.1 0.000481 0.24 AML other m 2021-09-01T16:31:39.71
IV.HLNI.HHN. ML:1.7 0.00010585 0.16 AML other m 2021-09-01T16:31:40.14
IV.EMSG.HHE. ML:1.8 0.0003115 0.4 AML other m 2021-09-01T16:31:40.57
IV.HLNI.HHE. ML:1.7 0.0001085 0.14 AML other m 2021-09-01T16:31:41.47
IV.EMPL.HHE. ML:2.0 0.0004045 0.24 AML other m 2021-09-01T16:31:41.83
IV.SSY.HHN. ML:2.6 0.0005880000000000001 0.74 AML other m 2021-09-01T16:31:48.88
IV.SSY.HHE. ML:2.2 0.000238 0.24 AML other m 2021-09-01T16:31:49.29
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