Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 28-12-2022 and time 13:20:45 (UTC) in region 4 km N Borgo San Lorenzo (FI)

A magnitude ML 2.1 earthquake occured in region: 4 km N Borgo San Lorenzo (FI), on

  • 28-12-2022 13:20:45 (UTC)
  • 28-12-2022 14:20:45 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9920, 11.3830 at 9 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
Borgo San Lorenzo FI 4 18211 18211
Scarperia e San Piero FI 6 12217 30428
Vicchio FI 9 8044 38472
Barberino di Mugello FI 12 10836 49308
Vaglia FI 12 5073 54381
Firenzuola FI 14 4726 59107
Dicomano FI 16 5515 64622
Palazzuolo sul Senio FI 19 1154 65776
Vernio PO 19 6060 71836

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Prato (191150 inhabitants)
27 Km NE of Firenze (382808 inhabitants)
31 Km NE of Scandicci (50609 inhabitants)
38 Km E of Pistoia (90315 inhabitants)
48 Km SW of Imola (69797 inhabitants)
52 Km SW of Faenza (58541 inhabitants)
56 Km S of Bologna (386663 inhabitants)
59 Km W of Forlì (117913 inhabitants)
71 Km W of Cesena (96758 inhabitants)
71 Km NW of Arezzo (99543 inhabitants)
72 Km E of Lucca (89046 inhabitants)
75 Km N of Siena (53903 inhabitants)
81 Km SW of Ravenna (159116 inhabitants)
81 Km SE of Modena (184973 inhabitants)
84 Km E of Pisa (89158 inhabitants)
92 Km E of Viareggio (62467 inhabitants)
95 Km W of Rimini (147750 inhabitants)
96 Km S of Ferrara (133155 inhabitants)
96 Km SE of Carpi (70699 inhabitants)
99 Km SE of Reggio nell'Emilia (171345 inhabitants)
99 Km E of Livorno (159219 inhabitants)
99 Km E of Massa (69479 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 2.1 2022-12-28
13:20:45		 43.9923 11.3833 9 2024-03-01
15:28:15		 Bollettino Sismico Italiano INGV 113624121
Reviewed
Rev100 		ML 2.2 2022-12-28
13:20:45		 43.9908 11.3792 9 2022-12-28
13:28:22		 Sala Sismica INGV-Roma 113141291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2022-12-28 13:20:45 ± 0.05
Latitude 43.9923 ± 0.0027
Longitude 11.3833 ± 0.0038
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 113624121

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 254
Semi-minor axis of confidence ellipse (meter) 199
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 124
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 39
Number of associated phases, regardless of their use for origin computation 52
Number of defining phases 42
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.94789
Number of stations at which the event was observed 33
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 113141291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2022-12-28 13:28:22

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 42
Type of magnitude ML
Reference to an origin 113624121
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-06-19 09:52:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CH.FUORN.HHZ. 2022-12-28T13:22:05.85 3.0 undecidable manual Sn 3.46 0
IV.LRP.EHZ. 2022-12-28T13:21:39.01 3.0 undecidable manual Pg 8.95 0
GU.TRAV.HHZ. 2022-12-28T13:21:38.01 3.0 undecidable manual Pn 5.91 0
IV.MTCE.HHZ. 2022-12-28T13:21:26.05 3.0 negative manual Pg 4.84 0
GU.CANO.HHZ. 2022-12-28T13:21:25.36 3.0 undecidable manual Pn 3.29 0
IV.SMA1.EHZ. 2022-12-28T13:21:21.11 3.0 positive manual Pn 3.09 0
IV.NRCA.HHZ. 2022-12-28T13:21:18.62 3.0 undecidable manual Pg 4.13 0
OX.MARN.HHZ. 2022-12-28T13:21:15.99 3.0 negative manual Pg 2.36 0
IV.MOMA.HHZ. 2022-12-28T13:21:14.39 3.0 positive manual P 3.27 0
IV.CESI.HHZ. 2022-12-28T13:21:12.57 3.0 undecidable manual P 1.23 0
IV.BDI.HHZ. 2022-12-28T13:21:05.11 0.6 undecidable manual S 277 63.2922 50 -0.24 44
IV.CSNT.HHZ. 2022-12-28T13:21:04.05 0.3 undecidable manual S 187 58.0974 50 0.1 68
IV.PIEI.HHZ. 2022-12-28T13:21:04.08 0.6 undecidable manual P 118 105.2169 50 0.66 36
GU.EQUI.HHZ. 2022-12-28T13:21:03.86 0.3 undecidable manual P 282 99.9222 50 1.27 41
IV.OSSC.HHZ. 2022-12-28T13:21:02.74 0.6 undecidable manual S 192 53.1024 50 0.1 46
GU.POPM.HHZ. 2022-12-28T13:21:01.81 0.6 undecidable manual S 277 50.3163 50 -0.07 46
IV.PARC.HHZ. 2022-12-28T13:20:59.67 0.6 undecidable manual P 119 78.366 50 0.4 41
IV.BRIS.HHZ. 2022-12-28T13:20:59.56 0.6 undecidable manual S 50 39.9267 50 0.44 44
IV.MTRZ.HHZ. 2022-12-28T13:20:58.50 0.6 undecidable manual S 5 35.742 50 0.52 43
IV.SFI.EHZ. 2022-12-28T13:20:58.24 0.3 undecidable manual S 105 38.3283 50 -0.43 66
IV.CRMI.HHZ. 2022-12-28T13:20:58.43 0.6 undecidable manual S 236 38.9277 50 -0.42 44
IV.CSNT.HHZ. 2022-12-28T13:20:56.08 0.1 negative manual P 187 58.0974 50 -0.07 91
IV.CRE.HHZ. 2022-12-28T13:20:56.74 0.3 undecidable manual P 132 61.494 50 0.06 68
IV.BDI.HHZ. 2022-12-28T13:20:56.73 0.3 undecidable manual P 277 63.2922 50 -0.22 66
IV.OSSC.HHZ. 2022-12-28T13:20:55.33 0.1 undecidable manual P 192 53.1024 50 -0.06 92
IV.FIR.HNE. 2022-12-28T13:20:55.29 0.3 undecidable manual S 203 26.2515 108 0.21 70
IV.FNVD.HHZ. 2022-12-28T13:20:55.53 0.6 undecidable manual S 313 28.4493 107 -0.28 46
IV.MPPT.EHZ. 2022-12-28T13:20:54.00 0.3 undecidable manual S 261 23.6541 110 -0.24 70
GU.POPM.HHZ. 2022-12-28T13:20:54.68 0.6 undecidable manual P 277 50.3163 50 -0.27 44
IV.LMD.HHZ. 2022-12-28T13:20:54.92 0.3 undecidable manual S 70 27.5502 108 -0.57 64
IV.BRIS.HHZ. 2022-12-28T13:20:53.21 0.1 undecidable manual P 50 39.9267 50 -0.14 93
IV.VISG.HHZ. 2022-12-28T13:20:53.70 0.3 undecidable manual S 11 22.1556 112 -0.05 73
IV.CRMI.HHZ. 2022-12-28T13:20:53.00 0.1 positive manual P 236 38.9277 50 -0.2 92
IV.MTRZ.HHZ. 2022-12-28T13:20:53.05 0.1 undecidable manual P 5 35.742 50 0.35 90
IT.FIE.HGE. 2022-12-28T13:20:53.21 0.6 undecidable manual S 199 21.7671 112 -0.39 46
IV.RUFI.EHN. 2022-12-28T13:20:52.67 0.6 undecidable manual S 149 19.869 114 -0.34 46
IV.SFI.EHZ. 2022-12-28T13:20:52.72 0.3 undecidable manual P 105 38.3283 50 -0.38 67
IV.FNVD.HHZ. 2022-12-28T13:20:51.23 0.1 negative manual P 313 28.4493 107 -0.21 93
IV.VMGN.HHE. 2022-12-28T13:20:51.10 0.3 undecidable manual S 109 12.6762 125 0.29 71
IV.MOCL.EHZ. 2022-12-28T13:20:51.84 0.3 undecidable manual S 275 16.1727 118 -0.03 74
IV.FIR.HNE. 2022-12-28T13:20:51.25 0.3 undecidable manual P 203 26.2515 108 0.23 70
IV.LMD.HHZ. 2022-12-28T13:20:50.82 0.3 undecidable manual P 70 27.5502 108 -0.44 67
IV.VISG.HHZ. 2022-12-28T13:20:50.25 0.1 positive manual P 11 22.1556 112 -0.01 99
IV.MPPT.EHZ. 2022-12-28T13:20:50.52 0.1 positive manual P 261 23.6541 110 -0.02 98
IT.FIE.HGE. 2022-12-28T13:20:50.16 0.1 undecidable manual P 199 21.7671 112 -0.01 99
IV.MOCL.EHZ. 2022-12-28T13:20:49.35 0.1 positive manual P 275 16.1727 118 0.18 96
IV.BOSL.HHZ. 2022-12-28T13:20:49.44 0.3 undecidable manual S 186 6.8931 142 0.11 74
IV.SEI.HHZ. 2022-12-28T13:20:49.42 0.3 undecidable manual S 344 7.1928 141 0.03 76
IV.RUFI.EHN. 2022-12-28T13:20:49.80 0.1 undecidable manual P 149 19.869 114 -0.02 99
IV.VMGN.HHE. 2022-12-28T13:20:48.74 0.1 undecidable manual P 109 12.6762 125 0.18 97
IV.BOSL.HHZ. 2022-12-28T13:20:47.99 0.1 undecidable manual P 186 6.8931 142 0.29 95
IV.SEI.HHZ. 2022-12-28T13:20:47.80 0.1 undecidable manual P 344 7.1928 141 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BOSL.HHN. ML:2.3 0.0036900000000000006 0.52 AML other m 2022-12-28T13:20:49.61
IV.BOSL.HHE. ML:2.2 0.00249 0.18 AML other m 2022-12-28T13:20:49.79
IV.SEI.HHN. ML:2.8 0.0111 0.62 AML other m 2022-12-28T13:20:49.55
IV.SEI.HHE. ML:2.4 0.00452 1.72 AML other m 2022-12-28T13:20:50.94
IV.MOCL.EHN. ML:2.7 0.004699999999999999 1.86 AML other m 2022-12-28T13:20:51.06
IV.MOCL.EHE. ML:2.7 0.004804999999999999 0.24 AML other m 2022-12-28T13:20:52.27
IV.VISG.HHE. ML:2.2 0.001224 0.12 AML other m 2022-12-28T13:20:53.90
IV.VISG.HHN. ML:2.0 0.000753 1.56 AML other m 2022-12-28T13:20:54.91
IV.MPPT.EHE. ML:2.0 0.0006915000000000001 0.22 AML other m 2022-12-28T13:20:54.20
IV.MPPT.EHN. ML:2.1 0.0007844999999999999 0.22 AML other m 2022-12-28T13:20:54.50
IV.LMD.HHE. ML:2.2 0.0009695 0.32 AML other m 2022-12-28T13:20:55.31
IV.LMD.HHN. ML:2.4 0.0012900000000000001 0.68 AML other m 2022-12-28T13:20:55.15
IV.FNVD.HHE. ML:1.9 0.0004325 0.32 AML other m 2022-12-28T13:20:56.67
IV.FNVD.HHN. ML:2.1 0.0006575 0.26 AML other m 2022-12-28T13:20:57.23
IV.SFI.HNE. ML:2.0 0.000409 0.6 AML other m 2022-12-28T13:20:58.71
IV.SFI.EHE. ML:2.1 0.0004290000000000001 0.28 AML other m 2022-12-28T13:20:58.71
IV.SFI.EHN. ML:2.1 0.000544 1.34 AML other m 2022-12-28T13:20:58.75
IV.SFI.HNN. ML:2.2 0.00055 1.34 AML other m 2022-12-28T13:20:58.75
IV.CRMI.HHN. ML:2.0 0.000388 0.34 AML other m 2022-12-28T13:20:58.82
IV.CRMI.HHE. ML:1.8 0.000232 0.28 AML other m 2022-12-28T13:20:59.64
IV.MTRZ.HHE. ML:2.4 0.0009044999999999999 1.02 AML other m 2022-12-28T13:21:00.13
IV.MTRZ.HNE. ML:2.3 0.000877 1 AML other m 2022-12-28T13:21:00.14
IV.MTRZ.HNN. ML:2.3 0.0008065 0.64 AML other m 2022-12-28T13:21:00.24
IV.MTRZ.HHN. ML:2.3 0.00086 0.62 AML other m 2022-12-28T13:21:00.24
IV.BRIS.HHE. ML:1.7 0.00019250000000000002 0.3 AML other m 2022-12-28T13:21:00.18
IV.BRIS.HHN. ML:1.7 0.000183 0.26 AML other m 2022-12-28T13:21:00.34
IV.BRIS.HNN. ML:2.1 0.0004795 0.26 AML other m 2022-12-28T13:21:00.34
IV.BRIS.HNE. ML:2.1 0.000443 0.76 AML other m 2022-12-28T13:21:00.18
GU.POPM.HHN. ML:2.2 0.0003835 0.98 AML other m 2022-12-28T13:21:02.18
IV.OSSC.HHE. ML:2.4 0.000592 0.22 AML other m 2022-12-28T13:21:03.31
IV.OSSC.HHN. ML:2.2 0.00036899999999999997 0.5 AML other m 2022-12-28T13:21:04.46
IV.CSNT.HHE. ML:2.4 0.0005560000000000001 0.38 AML other m 2022-12-28T13:21:04.49
IV.CSNT.HHN. ML:2.6 0.0008029999999999999 0.26 AML other m 2022-12-28T13:21:04.86
GU.POPM.HHE. ML:2.1 0.00031800000000000003 0.22 AML other m 2022-12-28T13:21:05.67
IV.BDI.HHN. ML:2.0 0.0001985 0.82 AML other m 2022-12-28T13:21:06.98
IV.BDI.HHE. ML:2.0 0.000168 0.92 AML other m 2022-12-28T13:21:06.50
IV.CRE.HHE. ML:1.8 0.000113 0.56 AML other m 2022-12-28T13:21:10.37
IV.CRE.HHN. ML:2.0 0.0001835 0.36 AML other m 2022-12-28T13:21:11.34
IV.PARC.HHE. ML:1.4 0.000040300000000000004 0.32 AML other m 2022-12-28T13:21:15.28
IV.PARC.HHN. ML:1.6 0.00004905 0.54 AML other m 2022-12-28T13:21:17.54
IV.SSFR.HHN. ML:1.8 0.000041800000000000006 0.16 AML other m 2022-12-28T13:21:29.45
IV.SSFR.HHE. ML:2.0 0.00006905 1.84 AML other m 2022-12-28T13:21:33.01
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
Waveforms Seismic signals in miniseed + resp format Download