Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 17-11-2021 and time 04:46:17 (Italy) in region 5 km SE Firenzuola (FI)

A magnitude ML 1.3 earthquake occured in region: 5 km SE Firenzuola (FI), on

  • 17-11-2021 03:46:17 (UTC)
  • 17-11-2021 04:46:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0760, 11.4140 at 8 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
Firenzuola FI 5 4726 4726
Palazzuolo sul Senio FI 12 1154 5880
Borgo San Lorenzo FI 14 18211 24091
Scarperia e San Piero FI 15 12217 36308
Marradi FI 16 3139 39447
Vicchio FI 16 8044 47491
Barberino di Mugello FI 16 10836 58327
Castel del Rio BO 17 1246 59573
Monghidoro BO 18 3749 63322

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NE of Prato (191150 inhabitants)
36 Km NE of Firenze (382808 inhabitants)
39 Km SW of Imola (69797 inhabitants)
40 Km NE of Scandicci (50609 inhabitants)
43 Km E of Pistoia (90315 inhabitants)
44 Km SW of Faenza (58541 inhabitants)
47 Km S of Bologna (386663 inhabitants)
53 Km W of Forlì (117913 inhabitants)
67 Km W of Cesena (96758 inhabitants)
73 Km SW of Ravenna (159116 inhabitants)
74 Km SE of Modena (184973 inhabitants)
77 Km E of Lucca (89046 inhabitants)
78 Km NW of Arezzo (99543 inhabitants)
84 Km N of Siena (53903 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
89 Km SE of Carpi (70699 inhabitants)
90 Km E of Pisa (89158 inhabitants)
92 Km W of Rimini (147750 inhabitants)
93 Km SE of Reggio nell'Emilia (171345 inhabitants)
96 Km E of Viareggio (62467 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 1.3 2021-11-17
03:46:17		 44.0763 11.4142 8 2022-03-30
13:04:17		 Bollettino Sismico Italiano INGV 97776641
Reviewed
Rev100 		ML 1.3 2021-11-17
03:46:17		 44.0727 11.4178 8 2021-11-17
03:59:08		 Sala Sismica INGV-Roma 97506961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-17 03:46:17 ± 0.05
Latitude 44.0763 ± 0.0027
Longitude 11.4142 ± 0.0038
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97776641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 274
Semi-minor axis of confidence ellipse (meter) 206
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 179
Circular confidence region, given by single value of horizontal uncertainty (meter) 270.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.04587
Epicentral distance of station farthest from the epicenter (degree) 0.47304
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:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 97506961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-17 03:59:08

ML:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 97776641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-25 08:38:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.POPM.HHZ. 2021-11-17T03:46:34.11 0.3 undecidable manual S 266 52.503 50 0.02 71
IV.ASQU.HHE. 2021-11-17T03:46:31.57 0.6 undecidable manual S 136 43.1235 50 -0.02 48
IV.SFI.EHZ. 2021-11-17T03:46:30.48 0.3 undecidable manual S 119 39.4272 50 -0.12 71
IV.BRIS.HHN. 2021-11-17T03:46:29.13 0.6 undecidable manual S 60 32.5452 105 0.44 45
IV.MPPT.EHZ. 2021-11-17T03:46:27.41 0.6 undecidable manual S 243 29.0487 106 -0.1 48
IV.MTRZ.HNZ. 2021-11-17T03:46:26.31 0.6 undecidable manual S 2 26.2515 108 -0.29 47
GU.POPM.HHZ. 2021-11-17T03:46:26.91 0.3 undecidable manual P 266 52.503 50 0.03 71
IV.RUFI.EHZ. 2021-11-17T03:46:26.81 0.3 undecidable manual S 164 27.5502 107 -0.21 71
IV.CRMI.HNN. 2021-11-17T03:46:26.18 0.1 undecidable manual P 228 46.62 50 0.2 92
IV.FNVD.HHZ. 2021-11-17T03:46:26.27 0.6 undecidable manual S 294 25.3524 108 -0.02 50
IV.ASQU.HHE. 2021-11-17T03:46:25.17 0.1 undecidable manual P 136 43.1235 50 -0.27 91
IV.LMD.HHZ. 2021-11-17T03:46:25.84 0.3 undecidable manual S 90 23.3544 110 0.19 72
IV.SFI.EHZ. 2021-11-17T03:46:24.54 0.3 undecidable manual P 119 39.4272 50 -0.33 68
IV.BRIS.HHN. 2021-11-17T03:46:24.00 0.1 undecidable manual P 60 32.5452 105 0.24 94
IV.MOCL.EHZ. 2021-11-17T03:46:24.70 0.6 undecidable manual S 247 20.2686 113 0.06 50
IV.MTRZ.HNZ. 2021-11-17T03:46:23.03 0.6 undecidable manual P 2 26.2515 108 0.48 45
IV.BOSL.HHZ. 2021-11-17T03:46:23.74 0.3 undecidable manual S 191 16.4724 117 0.3 71
IV.MPPT.EHZ. 2021-11-17T03:46:23.03 0.1 undecidable manual P 243 29.0487 106 -0.05 98
IV.FNVD.HHZ. 2021-11-17T03:46:22.30 0.1 undecidable manual P 294 25.3524 108 -0.08 98
IV.VISG.HHZ. 2021-11-17T03:46:22.07 0.3 undecidable manual S 7 12.5763 124 -0.22 73
IV.RUFI.EHZ. 2021-11-17T03:46:22.81 0.3 undecidable manual P 164 27.5502 107 0.01 74
IV.BOSL.HHZ. 2021-11-17T03:46:21.18 0.3 undecidable manual P 191 16.4724 117 0.45 69
IV.MOCL.EHZ. 2021-11-17T03:46:21.67 0.1 undecidable manual P 247 20.2686 113 0.25 95
IV.LMD.HHZ. 2021-11-17T03:46:21.68 0.3 undecidable manual P 90 23.3544 110 -0.33 70
IV.SEI.HHZ. 2021-11-17T03:46:20.03 0.3 undecidable manual S 241 5.0949 149 -0.41 71
IV.VISG.HHZ. 2021-11-17T03:46:20.15 0.1 positive manual P 7 12.5763 124 0.08 100
IV.SEI.HHZ. 2021-11-17T03:46:18.85 0.1 undecidable manual P 241 5.0949 149 -0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:0.0 0.000255 0.58 AML other m 2021-11-17T03:46:22.11
IV.VISG.HHN. ML:0.0 0.00019920565000000002 0.1792 AML other m 2021-11-17T03:46:22.33
IV.BOSL.HHN. ML:0.0 0.000033212425 0.08 AML other m 2021-11-17T03:46:24.14
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