Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 27-01-2023 and time 13:50:41 (UTC) in region 6 km W San Godenzo (FI)

A magnitude ML 1.0 earthquake occured in region: 6 km W San Godenzo (FI), on

  • 27-01-2023 13:50:41 (UTC)
  • 27-01-2023 14:50:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9540, 11.5530 at 7 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
San Godenzo FI 6 1167 1167
Dicomano FI 7 5515 6682
Vicchio FI 7 8044 14726
Londa FI 10 1840 16566
Borgo San Lorenzo FI 13 18211 34777
Marradi FI 14 3139 37916
Rufina FI 15 7346 45262
Palazzuolo sul Senio FI 18 1154 46416
Premilcuore FC 18 799 47215
Scarperia e San Piero FI 18 12217 59432

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km NE of Firenze (382808 inhabitants)
37 Km NE of Scandicci (50609 inhabitants)
37 Km E of Prato (191150 inhabitants)
45 Km SW of Faenza (58541 inhabitants)
46 Km S of Imola (69797 inhabitants)
49 Km SW of Forlì (117913 inhabitants)
51 Km E of Pistoia (90315 inhabitants)
59 Km W of Cesena (96758 inhabitants)
60 Km NW of Arezzo (99543 inhabitants)
63 Km S of Bologna (386663 inhabitants)
73 Km N of Siena (53903 inhabitants)
73 Km SW of Ravenna (159116 inhabitants)
82 Km W of Rimini (147750 inhabitants)
85 Km E of Lucca (89046 inhabitants)
92 Km SE of Modena (184973 inhabitants)
96 Km E of Pisa (89158 inhabitants)
98 Km S of Ferrara (133155 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 1.0 2023-01-27
13:50:41		 43.9543 11.5532 7 2024-03-01
17:18:04		 Bollettino Sismico Italiano INGV 116521191
Reviewed
Rev100 		ML 0.8 2023-01-27
13:50:41		 43.954 11.5567 6 2023-01-27
14:15:01		 Sala Sismica INGV-Roma 113832501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-01-27 13:50:41 ± 0.1
Latitude 43.9543 ± 0.0036
Longitude 11.5532 ± 0.0037
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116521191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 400
Semi-minor axis of confidence ellipse (meter) 56
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 341
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 96
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.33275
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 113832501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-01-27 14:15:01

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 116521191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-04-19 14:29:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ACATE.HNZ. 2023-01-27T13:53:41.24 3.0 undecidable manual Sg 22.5 0
IV.GRI.EHZ. 2023-01-27T13:52:46.18 3.0 undecidable manual Sn 0.4 0
IV.CET2.HHZ. 2023-01-27T13:52:29.85 3.0 undecidable manual Sn 2.82 0
IV.TDS.HHZ. 2023-01-27T13:52:19.16 3.0 undecidable manual Sn -7.86 0
IV.SALB.HHZ. 2023-01-27T13:52:18.38 3.0 undecidable manual Sn -4.12 0
1J.FX12.HHZ.00 2023-01-27T13:52:07.74 3.0 positive manual Pg 20.360001 0
IV.MTMR.EHZ. 2023-01-27T13:51:59.03 3.0 undecidable manual Sg 8.16 0
IV.SGO.HHZ. 2023-01-27T13:51:50.26 3.0 undecidable manual Sn -9.99 0
IV.TDS.HHZ. 2023-01-27T13:51:50.39 3.0 undecidable manual Pg 20.43 0
IV.SALB.HHZ. 2023-01-27T13:51:49.40 3.0 negative manual Pg 21.98 0
IV.CIGN.HHZ. 2023-01-27T13:51:45.31 3.0 undecidable manual Sg 10.22 0
IV.MSSA.HHZ. 2023-01-27T13:51:42.05 3.0 undecidable manual Sg 2.47 0
CR.STON.BHZ. 2023-01-27T13:51:39.44 3.0 undecidable manual Pg 29.860001 0
IV.CAR1.HHZ. 2023-01-27T13:51:37.25 3.0 positive manual Pn 2.89 0
IV.BARO.EHZ. 2023-01-27T13:51:22.75 3.0 undecidable manual Sg -0.42 0
IV.PTCC.HHZ. 2023-01-27T13:51:15.62 3.0 positive manual Pg 17.870001 0
IV.MCRV.HHZ. 2023-01-27T13:51:11.08 3.0 undecidable manual Pn -0.76 0
IX.RSF3.HHZ.02 2023-01-27T13:51:10.74 3.0 negative manual Pn 1.03 0
IV.FOSV.EHZ. 2023-01-27T13:51:03.82 3.0 undecidable manual Sg 0.89 0
IV.EL6.EHZ. 2023-01-27T13:51:01.33 3.0 undecidable manual Sn 0.09 0
IV.SBPO.HNZ. 2023-01-27T13:50:54.77 3.0 negative manual Pn 0.65 0
IV.SFI.EHZ. 2023-01-27T13:50:50.54 0.6 undecidable manual S 103 24.1536 105 0.05 48
IV.MPPT.EHN. 2023-01-27T13:50:49.02 0.3 undecidable manual P 271 36.9297 100 -0.32 67
IV.SEI.HHZ. 2023-01-27T13:50:48.70 0.6 undecidable manual S 306 19.0698 109 -0.12 48
IV.LMD.HHZ. 2023-01-27T13:50:48.50 0.6 undecidable manual S 42 18.3705 110 -0.09 48
IV.BOSL.HHZ. 2023-01-27T13:50:47.67 0.6 undecidable manual S 260 14.4744 114 0.32 46
IV.SFI.EHZ. 2023-01-27T13:50:46.95 1.0 undecidable manual P 103 24.1536 105 0.12 24
IV.RUFI.EHE. 2023-01-27T13:50:46.80 0.3 undecidable manual S 195 13.3755 116 -0.19 72
IV.SEI.HHZ. 2023-01-27T13:50:45.82 0.6 positive manual P 306 19.0698 109 -0.04 49
IV.BOSL.HHZ. 2023-01-27T13:50:45.28 0.3 undecidable manual P 260 14.4744 114 0.27 70
IV.LMD.HHZ. 2023-01-27T13:50:45.79 0.3 positive manual P 42 18.3705 110 0.06 73
IV.RUFI.EHE. 2023-01-27T13:50:44.83 0.1 undecidable manual P 195 13.3755 116 0.02 99
IV.VMGN.HHN. 2023-01-27T13:50:44.10 0.1 undecidable manual S 271 1.5984 166 -0.06 100
IV.VMGN.HHN. 2023-01-27T13:50:43.27 0.1 undecidable manual P 271 1.5984 166 0.09 99
IV.EL6.EHZ. 2023-01-27T13:50:41.84 3.0 negative manual P 0.07 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.0 0.0000945 0.18 AML other m 2023-01-27T13:50:49.26
IV.LMD.HHE. ML:0.0 0.0001175 0.36 AML other m 2023-01-27T13:50:49.44
IV.BOSL.HHN. ML:0.0 0.00003785 1.06 AML other m 2023-01-27T13:50:48.00
IV.BOSL.HHE. ML:0.0 0.0000315 0.42 AML other m 2023-01-27T13:50:48.29
IV.SEI.HHN. ML:0.9 0.00006828485 0.1856 AML other m 2023-01-27T13:50:49.65
IV.SEI.HHE. ML:1.0 0.0000729729 0.4224 AML other m 2023-01-27T13:50:53.24
IV.SFI.EHE. ML:1.0 0.000062315955 0.1024 AML other m 2023-01-27T13:50:51.25
IV.SFI.EHN. ML:0.8 0.000046571390000000005 0.1024 AML other m 2023-01-27T13:50:51.12
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