Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-10-2021 and time 00:08:04 (UTC) in region 5 km SE Floresta (ME)

A magnitude ML 1.6 earthquake occured in region: 5 km SE Floresta (ME), on

  • 23-10-2021 00:08:04 (UTC)
  • 23-10-2021 02:08:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.9640, 14.9590 at 33 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
Floresta ME 5 485 485
Santa Domenica Vittoria ME 5 980 1465
Roccella Valdemone ME 6 666 2131
Montalbano Elicona ME 8 2287 4418
Randazzo CT 10 10900 15318
Malvagna ME 10 733 16051
San Piero Patti ME 10 2915 18966
Moio Alcantara ME 11 717 19683
Raccuja ME 11 1041 20724
Ucria ME 11 1058 21782
Tortorici ME 14 6435 28217
Basicò ME 14 612 28829
Librizzi ME 15 1660 30489
Tripi ME 16 873 31362
Novara di Sicilia ME 16 1337 32699
Sinagra ME 16 2705 35404
Maletto CT 17 3920 39324
Castiglione di Sicilia CT 17 3215 42539
Francavilla di Sicilia ME 17 3945 46484
Maniace CT 17 3765 50249
Sant'Angelo di Brolo ME 18 3090 53339
Galati Mamertino ME 18 2627 55966
Montagnareale ME 19 1615 57581
Castell'Umberto ME 19 3128 60709
Fondachelli-Fantina ME 19 1019 61728
Longi ME 19 1473 63201
Patti ME 20 13431 76632
San Salvatore di Fitalia ME 20 1319 77951
Ficarra ME 20 1469 79420
Oliveri ME 20 2181 81601

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of Acireale (52622 inhabitants)
52 Km N of Catania (314555 inhabitants)
58 Km W of Messina (238439 inhabitants)
62 Km W of Reggio di Calabria (183035 inhabitants)
95 Km NE 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 1.6 2021-10-23
00:08:04		 37.9642 14.959 33 2022-03-30
13:04:13		 Bollettino Sismico Italiano INGV 96978781
Reviewed
Rev100 		ML 1.5 2021-10-23
00:08:03		 37.9847 14.9547 34 2021-10-23
00:15:32		 Sala Sismica INGV-Roma 96892931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 00:08:04 ± 0.25
Latitude 37.9642 ± 0.0090
Longitude 14.9590 ± 0.0137
Depth (km) 33 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96978781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1229
Semi-minor axis of confidence ellipse (meter) 172
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 111
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
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) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.61963
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 12
Type of magnitude ML
Reference to an origin 96978781
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-25 11:16:43

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 11
Type of magnitude ML
Reference to an origin 96892931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 00:15:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IVUG.HHZ. 2021-10-23T00:08:21.10 0.6 undecidable manual S 3 47.9187 120 0.1 46
IV.IVPL.HNE. 2021-10-23T00:08:20.46 0.6 undecidable manual S 2 45.7209 121 -0.03 48
IV.AIO.HHE. 2021-10-23T00:08:16.31 0.6 undecidable manual S 88 23.9538 141 0.24 47
IV.MCPD.HHZ. 2021-10-23T00:08:16.47 0.6 undecidable manual S 311 26.3514 138 -0.01 50
IV.HLNI.HHZ. 2021-10-23T00:08:16.03 0.6 undecidable manual P 186 68.7756 111 -0.72 37
IV.EPZF.HHZ. 2021-10-23T00:08:15.75 0.3 undecidable manual S 210 17.9709 149 0.6 67
IV.IVGP.HHN. 2021-10-23T00:08:14.72 0.3 undecidable manual P 0 48.0186 120 0.86 54
IV.NOV.HHE. 2021-10-23T00:08:14.90 0.6 undecidable manual S 66 17.0718 150 -0.13 49
IV.IVUG.HHZ. 2021-10-23T00:08:13.64 0.3 undecidable manual P 3 47.9187 120 -0.22 69
IV.GALF.HHZ. 2021-10-23T00:08:13.75 0.6 undecidable manual P 231 44.4222 122 0.36 45
IV.MUCR.HHZ. 2021-10-23T00:08:13.47 0.6 undecidable manual S 320 11.4774 159 -0.93 38
IV.IVPL.HNE. 2021-10-23T00:08:13.83 0.6 undecidable manual P 2 45.7209 121 0.27 45
IV.AIO.HHE. 2021-10-23T00:08:11.14 0.3 undecidable manual P 88 23.9538 141 0.13 73
IV.ESCV.HHZ. 2021-10-23T00:08:11.45 0.6 undecidable manual P 208 27.1506 137 0.11 49
IV.NOV.HHE. 2021-10-23T00:08:10.33 0.3 undecidable manual P 66 17.0718 150 -0.08 75
IV.MCPD.HHZ. 2021-10-23T00:08:10.99 0.3 negative manual P 311 26.3514 138 -0.26 71
IV.EPZF.HHZ. 2021-10-23T00:08:10.36 0.1 negative manual P 210 17.9709 149 -0.12 98
IV.EMSG.HHZ. 2021-10-23T00:08:10.39 0.1 negative manual P 183 15.9729 152 0.06 100
IV.ECTS.HHZ. 2021-10-23T00:08:10.26 0.6 undecidable manual P 123 16.872 151 -0.14 49
IV.MUCR.HHZ. 2021-10-23T00:08:09.72 0.1 positive manual P 320 11.4774 159 -0.32 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MUCR.HHE. ML:1.3 0.00008952779 1.7 AML other m 2021-10-23T00:08:14.03
IV.MUCR.HHN. ML:1.8 0.00029800000000000003 0.4 AML other m 2021-10-23T00:08:14.93
IV.MCPD.HHE. ML:1.3 0.0000635 0.4 AML other m 2021-10-23T00:08:17.36
IV.MCPD.HHN. ML:1.2 0.00005063906 0.32 AML other m 2021-10-23T00:08:17.22
IV.GALF.HHN. ML:1.6 0.00009284554000000001 1.3 AML other m 2021-10-23T00:08:24.88
IV.GALF.HHE. ML:1.6 0.000099868725 1.08 AML other m 2021-10-23T00:08:24.93
IV.ESCV.HHN. ML:2.0 0.00032749295 1.24 AML other m 2021-10-23T00:08:25.19
IV.HLNI.HHN. ML:1.2 0.000026626965 0.24 AML other m 2021-10-23T00:08:27.33
IV.GALF.HNN. ML:1.7 0.000117419165 0.89 AML other m 2021-10-23T00:08:29.44
IV.GALF.HNE. ML:1.8 0.00014148595 0.91 AML other m 2021-10-23T00:08:30.35
IV.HLNI.HHE. ML:1.4 0.000035213210000000004 1.02 AML other m 2021-10-23T00:08:39.26
IV.ESCV.HHE. ML:1.8 0.0001960574 0.52 AML other m 2021-10-23T00:08:25.89
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