Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 09-07-2021 and time 11:57:46 (Italy) in region 4 km S Randazzo (CT)

A magnitude ML 1.6 earthquake occured in region: 4 km S Randazzo (CT), on

  • 09-07-2021 09:57:46 (UTC)
  • 09-07-2021 11:57:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8470, 14.9410 at 30 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
Randazzo CT 4 10900 10900
Maletto CT 7 3920 14820
Santa Domenica Vittoria ME 8 980 15800
Moio Alcantara ME 11 717 16517
Roccella Valdemone ME 11 666 17183
Bronte CT 12 19172 36355
Maniace CT 12 3765 40120
Malvagna ME 13 733 40853
Floresta ME 16 485 41338
Castiglione di Sicilia CT 17 3215 44553
Linguaglossa CT 18 5403 49956
Francavilla di Sicilia ME 18 3945 53901

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NW of Acireale (52622 inhabitants)
40 Km NW of Catania (314555 inhabitants)
66 Km SW of Messina (238439 inhabitants)
68 Km W of Reggio di Calabria (183035 inhabitants)
87 Km E of Caltanissetta (63360 inhabitants)
93 Km NW 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 1.6 2021-07-09
09:57:46		 37.8467 14.9413 30 2021-12-29
11:12:44		 Bollettino Sismico Italiano INGV 97148491
Reviewed
Rev200 		ML 1.6 2021-07-09
09:57:46		 37.849 14.928 27 2021-11-01
18:01:51		 Sala Operativa INGV_OE (Catania) 92486591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-09 09:57:46 ± 0.16
Latitude 37.8467 ± 0.0063
Longitude 14.9413 ± 0.0068
Depth (km) 30 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97148491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 630
Semi-minor axis of confidence ellipse (meter) 457
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 143
Circular confidence region, given by single value of horizontal uncertainty (meter) 630.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.02698
Epicentral distance of station farthest from the epicenter (degree) 0.50092
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 97148491
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-01 18:01:34

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 92486591
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-07-09 10:03:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-07-09T09:58:04.90 0.6 undecidable manual S 186 55.5999 113 -0.39 44
IV.MSFR.HHZ. 2021-07-09T09:58:00.94 0.6 undecidable manual S 304 37.0296 124 0.04 48
IV.AIO.HHZ. 2021-07-09T09:57:59.64 0.6 undecidable manual S 61 29.0487 131 0.43 46
IV.NOV.HHZ. 2021-07-09T09:57:58.54 0.6 undecidable manual S 40 26.3514 134 -0.15 49
IV.MUCR.HHZ. 2021-07-09T09:57:57.79 0.6 undecidable manual S 345 22.5552 139 -0.2 49
IV.HLNI.HHZ. 2021-07-09T09:57:57.32 0.3 undecidable manual P 186 55.5999 113 -0.23 69
IV.EPIT.HHZ. 2021-07-09T09:57:56.64 0.6 undecidable manual S 111 10.878 158 0.31 49
IV.EPZF.HHZ. 2021-07-09T09:57:56.00 0.6 undecidable manual S 251 7.7811 164 -0.07 52
IV.ECTS.HHN. 2021-07-09T09:57:56.62 0.6 undecidable manual S 76 16.1727 149 -0.36 47
IV.EMNR.HHZ. 2021-07-09T09:57:56.35 0.6 undecidable manual S 114 8.0808 163 0.26 50
IV.GALF.HHZ. 2021-07-09T09:57:55.49 0.3 undecidable manual P 245 36.1416 124 0.58 64
IV.MSFR.HHZ. 2021-07-09T09:57:55.13 0.1 undecidable manual P 304 37.0296 124 0.11 96
IV.AIO.HHZ. 2021-07-09T09:57:54.14 0.1 positive manual P 61 29.0487 131 0.1 99
IV.ESAL.HHN. 2021-07-09T09:57:53.52 0.3 undecidable manual P 121 19.7691 143 0.46 70
IV.MUCR.HHZ. 2021-07-09T09:57:53.08 0.1 undecidable manual P 345 22.5552 139 -0.26 97
IV.NOV.HHZ. 2021-07-09T09:57:53.68 0.1 undecidable manual P 40 26.3514 134 -0.06 100
IV.ECTS.HHN. 2021-07-09T09:57:52.56 0.3 undecidable manual P 76 16.1727 149 -0.2 74
IV.EMNR.HHZ. 2021-07-09T09:57:52.25 0.3 undecidable manual P 114 8.0808 163 0.01 78
IV.EMCN.HHN. 2021-07-09T09:57:52.47 0.3 undecidable manual P 127 10.1787 159 0.12 76
IV.EPIT.HHZ. 2021-07-09T09:57:52.45 0.3 undecidable manual P 111 10.878 158 0.07 77
IV.EPZF.HHZ. 2021-07-09T09:57:51.93 0.1 undecidable manual P 251 7.7811 164 -0.3 99
IV.EMSG.HHN. 2021-07-09T09:57:51.97 0.3 undecidable manual P 166 2.997 174 -0.12 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.EPZF.HHE. ML:1.9 0.00037 0.38 AML other m 2021-07-09T09:57:56.37
IV.EPZF.HHN. ML:1.9 0.00038749999999999993 0.78 AML other m 2021-07-09T09:57:56.97
IV.EMSG.HHE. ML:1.9 0.0004325 0.34 AML other m 2021-07-09T09:57:56.97
IV.ECTS.HHN. ML:1.9 0.000383 0.28 AML other m 2021-07-09T09:57:57.16
IV.ECTS.HHE. ML:1.6 0.0001915 0.52 AML other m 2021-07-09T09:57:57.26
IV.EMSG.HHN. ML:1.8 0.0003355 0.22 AML other m 2021-07-09T09:57:57.64
IV.MUCR.HHN. ML:1.3 0.00008265 0.46 AML other m 2021-07-09T09:57:58.12
IV.MUCR.HHE. ML:1.6 0.00014099999999999998 1.48 AML other m 2021-07-09T09:57:58.24
IV.AIO.HHE. ML:1.2 0.0000504 0.24 AML other m 2021-07-09T09:57:59.84
IV.AIO.HHN. ML:1.4 0.00008335 1.72 AML other m 2021-07-09T09:58:01.01
IV.MSFR.HHE. ML:1.1 0.00004165 0.24 AML other m 2021-07-09T09:58:01.31
IV.MSFR.HHN. ML:1.1 0.00003465 0.22 AML other m 2021-07-09T09:58:01.25
IV.GALF.HHE. ML:1.6 0.000126 0.52 AML other m 2021-07-09T09:58:04.64
IV.HLNI.HHE. ML:1.7 0.000093 0.24 AML other m 2021-07-09T09:58:05.38
IV.HLNI.HHN. ML:1.6 0.00006855 0.46 AML other m 2021-07-09T09:58:06.53
IV.GALF.HHN. ML:1.5 0.00009215 0.38 AML other m 2021-07-09T09:58:09.99
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