Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 02-08-2021 and time 20:50:37 (Italy) in region 1 km NW Gaggi (ME)

A magnitude ML 1.4 earthquake occured in region: 1 km NW Gaggi (ME), on

  • 02-08-2021 18:50:37 (UTC)
  • 02-08-2021 20:50:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.8680, 15.2090 at 20 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
Gaggi ME 1 3184 3184
Graniti ME 3 1492 4676
Motta Camastra ME 4 845 5521
Calatabiano CT 5 5308 10829
Castelmola ME 6 1088 11917
Linguaglossa CT 6 5403 17320
Giardini-Naxos ME 7 9415 26735
Taormina ME 7 10960 37695
Piedimonte Etneo CT 7 3963 41658
Mongiuffi Melia ME 7 600 42258
Francavilla di Sicilia ME 7 3945 46203
Castiglione di Sicilia CT 8 3215 49418
Fiumefreddo di Sicilia CT 8 9623 59041
Gallodoro ME 8 367 59408
Letojanni ME 9 2861 62269
Roccafiorita ME 9 197 62466
Limina ME 10 836 63302
Mascali CT 12 14282 77584
Forza d'Agrò ME 12 911 78495
Antillo ME 13 919 79414
Sant'Alessio Siculo ME 13 1554 80968
Fondachelli-Fantina ME 14 1019 81987
Moio Alcantara ME 14 717 82704
Casalvecchio Siculo ME 14 842 83546
Malvagna ME 15 733 84279
Sant'Alfio CT 15 1582 85861
Riposto CT 15 14838 100699
Savoca ME 15 1732 102431
Giarre CT 15 27659 130090
Santa Teresa di Riva ME 17 9377 139467
Novara di Sicilia ME 18 1337 140804
Mandanici ME 18 601 141405
Milo CT 18 1087 142492
Furci Siculo ME 18 3382 145874
Pagliara ME 19 1170 147044
Roccella Valdemone ME 19 666 147710

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km N of Acireale (52622 inhabitants)
42 Km N of Catania (314555 inhabitants)
47 Km SW of Reggio di Calabria (183035 inhabitants)
47 Km SW of Messina (238439 inhabitants)
90 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 1.4 2021-08-02
18:50:37		 37.8685 15.2087 20 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97383561
Reviewed
Rev200 		ML 1.2 2021-08-02
18:50:37		 37.879 15.188 16 2021-11-10
17:04:21		 Sala Operativa INGV_OE (Catania) 93575651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-02 18:50:37 ± 0.24
Latitude 37.8685 ± 0.0081
Longitude 15.2087 ± 0.0182
Depth (km) 20 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97383561

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1216
Semi-minor axis of confidence ellipse (meter) 1210
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 290
Circular confidence region, given by single value of horizontal uncertainty (meter) 1220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 157
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.07015
Epicentral distance of station farthest from the epicenter (degree) 0.91101
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:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 97383561
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-10 17:04:01

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 93575651
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-02 18:59:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-08-02T18:51:07.76 0.6 undecidable manual S 184 101.121 96 0.89 34
IV.HLNI.HHZ. 2021-08-02T18:50:56.74 0.6 undecidable manual S 207 64.7907 100 -0.53 41
IV.HAVL.HHZ. 2021-08-02T18:50:54.11 0.3 undecidable manual P 184 101.121 96 -0.26 61
IV.MPNC.HHZ. 2021-08-02T18:50:49.88 0.6 undecidable manual S 22 33.3444 113 0.72 40
IV.EPZF.HHZ. 2021-08-02T18:50:49.45 0.6 undecidable manual S 261 31.2465 115 0.81 39
IV.HLNI.HHZ. 2021-08-02T18:50:48.42 0.3 undecidable manual P 207 64.7907 100 -0.41 63
IV.NOV.HHZ. 2021-08-02T18:50:45.76 0.6 undecidable manual S 340 18.7701 131 -0.07 50
IV.EPIT.HHZ. 2021-08-02T18:50:45.67 0.6 undecidable manual S 245 14.7741 139 0.61 44
IV.EPZF.HHZ. 2021-08-02T18:50:44.07 0.3 undecidable manual P 261 31.2465 115 0.23 70
IV.MPNC.HHZ. 2021-08-02T18:50:44.30 0.3 undecidable manual P 22 33.3444 113 0.15 71
IV.AIO.HHZ. 2021-08-02T18:50:44.50 0.6 undecidable manual S 11 11.5773 146 -0.05 50
IV.EFIU.HHE. 2021-08-02T18:50:44.94 0.6 undecidable manual S 179 8.7801 153 0.77 42
IV.ECTS.HHZ. 2021-08-02T18:50:43.28 0.6 undecidable manual S 281 7.7811 156 -0.78 41
IV.EMNR.HHZ. 2021-08-02T18:50:42.04 0.3 undecidable manual P 250 16.9719 134 0.02 75
IV.EMSG.HHZ. 2021-08-02T18:50:42.94 0.3 undecidable manual P 257 23.2545 124 0.16 72
IV.AIO.HHZ. 2021-08-02T18:50:41.36 0.1 undecidable manual P 11 11.5773 146 -0.12 99
IV.EPIT.HHZ. 2021-08-02T18:50:41.84 0.1 undecidable manual P 245 14.7741 139 0.06 100
IV.EFIU.HHE. 2021-08-02T18:50:41.19 0.3 undecidable manual P 179 8.7801 153 -0.07 75
IV.ECBD.HHN. 2021-08-02T18:50:41.72 0.3 undecidable manual P 228 14.4744 139 -0.04 75
IV.NOV.HHZ. 2021-08-02T18:50:41.99 0.1 undecidable manual P 340 18.7701 131 -0.23 96
IV.ECTS.HHZ. 2021-08-02T18:50:40.62 0.1 undecidable manual P 281 7.7811 156 -0.58 89
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.AIO.HHE. ML:1.3 0.00014600000000000003 0.18 AML other m 2021-08-02T18:50:44.69
IV.AIO.HHN. ML:1.2 0.00010125000000000001 0.42 AML other m 2021-08-02T18:50:46.68
IV.MPNC.HHE. ML:1.4 0.00009329999999999999 1.46 AML other m 2021-08-02T18:50:50.09
IV.MPNC.HHN. ML:1.6 0.00014649999999999998 0.78 AML other m 2021-08-02T18:50:50.28
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