Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 03-08-2021 and time 18:13:02 (Italy) in region 3 km SE Randazzo (CT)

A magnitude ML 1.8 earthquake occured in region: 3 km SE Randazzo (CT), on

  • 03-08-2021 16:13:02 (UTC)
  • 03-08-2021 18:13:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8610, 14.9770 at 29 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Randazzo CT 3 10900 10900
Santa Domenica Vittoria ME 6 980 11880
Moio Alcantara ME 8 717 12597
Roccella Valdemone ME 9 666 13263
Malvagna ME 10 733 13996
Maletto CT 10 3920 17916
Castiglione di Sicilia CT 13 3215 21131
Francavilla di Sicilia ME 15 3945 25076
Linguaglossa CT 15 5403 30479
Maniace CT 15 3765 34244
Bronte CT 15 19172 53416
Floresta ME 15 485 53901
Motta Camastra ME 18 845 54746
Montalbano Elicona ME 19 2287 57033
Piedimonte Etneo CT 19 3963 60996
Milo CT 20 1087 62083
Sant'Alfio CT 20 1582 63665

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Acireale (52622 inhabitants)
41 Km N of Catania (314555 inhabitants)
63 Km SW of Messina (238439 inhabitants)
65 Km W of Reggio di Calabria (183035 inhabitants)
90 Km E of Caltanissetta (63360 inhabitants)
93 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 1.8 2021-08-03
16:13:02		 37.8607 14.9773 29 2021-12-29
11:12:53		 Bollettino Sismico Italiano INGV 98467171
Reviewed
Rev200 		ML 1.7 2021-08-03
16:13:02		 37.854 14.98 26 2021-12-13
15:02:00		 Sala Operativa INGV_OE (Catania) 93623161
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-03 16:13:02 ± 0.15
Latitude 37.8607 ± 0.0072
Longitude 14.9773 ± 0.0114
Depth (km) 29 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98467171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1013
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 118
Circular confidence region, given by single value of horizontal uncertainty (meter) 1010.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 48
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.90742
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 93623161
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-03 16:18:41

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 98467171
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-13 15:01:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RIBO.EHZ.01 2021-08-03T16:14:46.22 3.0 positive manual Pg 18 0
IV.LRP.EHZ. 2021-08-03T16:14:45.23 3.0 undecidable manual Sn -1.39 0
IX.SCL3.EHZ.02 2021-08-03T16:14:26.86 3.0 undecidable manual Sg 6.39 0
IV.MTMR.EHZ. 2021-08-03T16:14:25.06 3.0 undecidable manual Sn -0.13 0
IV.GAVE.EHZ. 2021-08-03T16:14:22.27 3.0 positive manual Pn 5.33 0
IV.PZUN.HHZ. 2021-08-03T16:14:21.55 3.0 undecidable manual Sn 1.22 0
IV.RMP.HHZ. 2021-08-03T16:14:13.16 3.0 negative manual Pg 6.72 0
IV.PTRJ.HNZ. 2021-08-03T16:14:05.86 3.0 undecidable manual Pg 10.42 0
IX.SCL3.EHZ.02 2021-08-03T16:13:56.92 3.0 negative manual Pg 10.47 0
IX.RSF3.HHZ.02 2021-08-03T16:13:54.59 3.0 undecidable manual Pg 4.81 0
IV.MARS.HHZ. 2021-08-03T16:13:52.64 3.0 undecidable manual Sn -4.75 0
IV.ORI.HHZ. 2021-08-03T16:13:50.34 3.0 undecidable manual Pg 9.25 0
IV.MTGR.HHZ. 2021-08-03T16:13:30.73 3.0 undecidable manual Pn -0.57 0
IV.HLNI.HHZ. 2021-08-03T16:13:21.18 0.6 undecidable manual S 189 57.5979 111 -0.34 42
IV.HAVL.HHZ. 2021-08-03T16:13:19.57 0.3 undecidable manual P 173 100.7214 101 -0.45 57
IV.RAFF.HHZ. 2021-08-03T16:13:18.68 0.3 undecidable manual P 218 89.0442 103 0.41 60
IV.SSY.HHZ. 2021-08-03T16:13:16.38 0.3 undecidable manual P 174 78.4659 105 -0.29 62
IV.MSRU.HHZ. 2021-08-03T16:13:15.34 0.3 undecidable manual P 46 64.3911 109 0.73 56
IV.IVUG.HHZ. 2021-08-03T16:13:13.87 0.3 undecidable manual P 1 59.3961 110 0 68
IV.HLNI.HHZ. 2021-08-03T16:13:13.26 0.1 undecidable manual P 189 57.5979 111 -0.35 85
IV.ESAL.HHE. 2021-08-03T16:13:13.77 0.6 undecidable manual S 130 18.0708 145 0.88 39
IV.AIO.HHZ. 2021-08-03T16:13:13.58 0.6 undecidable manual S 61 25.5522 134 -0.61 42
IV.EMFO.HHE. 2021-08-03T16:13:13.38 0.6 undecidable manual S 144 17.0718 146 0.64 42
IV.IVPL.HHZ. 2021-08-03T16:13:13.95 0.3 undecidable manual P 0 57.1983 111 0.39 63
IV.NOV.HHZ. 2021-08-03T16:13:13.15 0.6 undecidable manual S 37 23.1546 137 -0.61 43
IV.MPNC.HHZ. 2021-08-03T16:13:12.11 0.3 undecidable manual P 46 45.621 117 0.18 68
IV.EPIT.HHZ. 2021-08-03T16:13:12.03 0.6 undecidable manual S 128 8.88 161 0.27 47
IV.EMCN.HHN. 2021-08-03T16:13:12.00 0.6 undecidable manual S 147 9.1797 161 0.21 48
IV.ECBD.HHN. 2021-08-03T16:13:12.49 0.6 undecidable manual S 133 13.0758 153 0.29 47
IV.ECTS.HHZ. 2021-08-03T16:13:11.34 0.6 undecidable manual S 79 12.7761 154 -0.83 39
IV.EPZF.HHZ. 2021-08-03T16:13:11.91 0.6 undecidable manual S 249 11.2776 156 -0.09 49
IV.GALF.HHZ. 2021-08-03T16:13:11.92 0.6 undecidable manual P 245 39.627 121 0.8 37
IV.EMNR.HHZ. 2021-08-03T16:13:11.67 0.6 undecidable manual S 139 6.4935 166 0.09 49
IV.EMSG.HHZ. 2021-08-03T16:13:11.80 0.6 undecidable manual S 209 4.995 169 0.3 47
IV.MCPD.HHZ. 2021-08-03T16:13:10.48 0.3 undecidable manual P 323 35.9418 124 -0.15 70
IV.AIO.HHZ. 2021-08-03T16:13:09.30 0.1 positive manual P 61 25.5522 134 -0.08 96
IV.EFIU.HHE. 2021-08-03T16:13:09.29 0.3 undecidable manual P 111 21.867 139 0.3 69
IV.ECBD.HHN. 2021-08-03T16:13:08.37 0.1 undecidable manual P 133 13.0758 153 0.14 97
IV.EMFO.HHE. 2021-08-03T16:13:08.65 0.3 undecidable manual P 144 17.0718 146 0.11 73
IV.NOV.HHZ. 2021-08-03T16:13:08.77 0.3 undecidable manual P 37 23.1546 137 -0.36 68
IV.ESVO.HHE. 2021-08-03T16:13:08.03 0.3 undecidable manual P 195 10.0788 159 -0.01 75
IV.ESAL.HHE. 2021-08-03T16:13:08.70 0.6 undecidable manual P 130 18.0708 145 0.07 49
IV.EMSG.HHZ. 2021-08-03T16:13:07.68 0.1 undecidable manual P 209 4.995 169 -0.15 98
IV.ECTS.HHZ. 2021-08-03T16:13:07.74 0.3 undecidable manual P 79 12.7761 154 -0.47 68
IV.EPZF.HHZ. 2021-08-03T16:13:07.84 0.1 undecidable manual P 249 11.2776 156 -0.27 95
IV.EPIT.HHZ. 2021-08-03T16:13:07.99 0.1 undecidable manual P 128 8.88 161 0.01 100
IV.EMNR.HHZ. 2021-08-03T16:13:07.91 0.1 undecidable manual P 139 6.4935 166 0.04 100
IV.EMCN.HHN. 2021-08-03T16:13:07.89 0.3 undecidable manual P 147 9.1797 161 -0.1 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EPZF.HHE. ML:1.7 0.000262 0.34 AML other m 2021-08-03T16:13:12.35
IV.EMSG.HHN. ML:1.9 0.00040800000000000005 0.64 AML other m 2021-08-03T16:13:12.34
IV.EPZF.HHN. ML:1.7 0.00022749999999999997 1.22 AML other m 2021-08-03T16:13:12.89
IV.EPIT.HHE. ML:2.1 0.00064 0.52 AML other m 2021-08-03T16:13:13.69
IV.EMSG.HHE. ML:1.9 0.000443 0.2 AML other m 2021-08-03T16:13:14.00
IV.AIO.HHE. ML:1.5 0.00010955 1.42 AML other m 2021-08-03T16:13:14.85
IV.AIO.HHN. ML:1.6 0.00013314999999999998 0.24 AML other m 2021-08-03T16:13:15.32
IV.EPIT.HHN. ML:2.1 0.0006730000000000001 0.64 AML other m 2021-08-03T16:13:16.02
IV.IVPL.HHN. ML:1.8 0.00011249999999999998 0.74 AML other m 2021-08-03T16:13:24.25
IV.IVPL.HHE. ML:1.8 0.00011875 0.64 AML other m 2021-08-03T16:13:27.60
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