Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-09-2023 and time 11:12:04 (Italy) in region 1 km SW San Godenzo (FI)

A magnitude ML 1.4 earthquake occured in region: 1 km SW San Godenzo (FI), on

  • 21-09-2023 09:12:04 (UTC)
  • 21-09-2023 11:12:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9210, 11.6160 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 1 1167 1167
Londa FI 8 1840 3007
Dicomano FI 8 5515 8522
Vicchio FI 12 8044 16566
Premilcuore FC 14 799 17365
Rufina FI 15 7346 24711
Pratovecchio Stia AR 17 5845 30556
Marradi FI 17 3139 33695
Portico e San Benedetto FC 18 756 34451
Borgo San Lorenzo FI 19 18211 52662
Pelago FI 19 7660 60322
Montemignaio AR 20 566 60888

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km NE of Firenze (382808 inhabitants)
39 Km E of Scandicci (50609 inhabitants)
42 Km E of Prato (191150 inhabitants)
46 Km SW of Faenza (58541 inhabitants)
48 Km SW of Forlì (117913 inhabitants)
49 Km S of Imola (69797 inhabitants)
55 Km NW of Arezzo (99543 inhabitants)
56 Km W of Cesena (96758 inhabitants)
56 Km E of Pistoia (90315 inhabitants)
67 Km SE of Bologna (386663 inhabitants)
71 Km NE of Siena (53903 inhabitants)
72 Km SW of Ravenna (159116 inhabitants)
78 Km W of Rimini (147750 inhabitants)
90 Km E of Lucca (89046 inhabitants)
98 Km SE of Modena (184973 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
Reviewed
Rev100 		ML 1.4 2023-09-21
09:12:04		 43.9212 11.6157 8 2023-09-21
09:27:49		 Sala Sismica INGV-Roma 121306741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 09:12:04 ± 0.04
Latitude 43.9212 ± 0.0018
Longitude 11.6157 ± 0.0025
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121306741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 224
Semi-minor axis of confidence ellipse (meter) 219
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 29
Circular confidence region, given by single value of horizontal uncertainty (meter) 220.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47844
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 121306741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 09:27:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRMI.HHE. 2023-09-21T09:12:21.72 0.6 undecidable manual S 255 52.7028 50 0.31 44
IV.MPPT.EHZ. 2023-09-21T09:12:18.50 0.6 undecidable manual S 276 42.1245 50 -0.08 47
IV.CRE.HHN. 2023-09-21T09:12:18.92 0.6 undecidable manual S 141 43.0236 50 0.12 46
IV.MOCL.EHZ. 2023-09-21T09:12:16.82 0.6 undecidable manual S 285 35.9418 50 -0.1 47
IV.VISG.HHZ. 2023-09-21T09:12:16.01 0.6 undecidable manual S 334 33.0447 104 -0.09 47
IV.CRMI.HHE. 2023-09-21T09:12:14.30 0.1 undecidable manual P 255 52.7028 50 0.14 90
IV.OSSC.HHE. 2023-09-21T09:12:14.33 0.1 undecidable manual P 214 53.1024 50 0.1 91
IV.SEI.HHZ. 2023-09-21T09:12:13.48 0.6 undecidable manual S 306 25.2525 108 -0.03 48
IV.CRE.HHN. 2023-09-21T09:12:12.39 0.1 undecidable manual P 141 43.0236 50 -0.27 90
IV.MPPT.EHZ. 2023-09-21T09:12:12.42 0.1 undecidable manual P 276 42.1245 50 -0.11 93
IV.LMD.HHN. 2023-09-21T09:12:11.58 0.6 undecidable manual S 23 18.87 114 0.16 48
IV.MOCL.EHZ. 2023-09-21T09:12:11.43 0.1 undecidable manual P 285 35.9418 50 -0.14 93
IV.BOSL.HHE. 2023-09-21T09:12:11.65 0.6 undecidable manual S 273 19.2696 113 0.08 49
IV.SFI.HNE. 2023-09-21T09:12:11.45 0.6 undecidable manual S 96 18.5703 114 0.11 48
IT.MRR.HGN. 2023-09-21T09:12:10.47 0.6 undecidable manual S 356 15.873 118 -0.04 49
IV.VISG.HHZ. 2023-09-21T09:12:10.89 0.1 undecidable manual P 334 33.0447 104 -0.21 92
IV.SEI.HHZ. 2023-09-21T09:12:09.45 0.3 undecidable manual P 306 25.2525 108 -0.16 71
IV.SMA1.EHZ. 2023-09-21T09:12:09.85 3.0 positive manual P 0.77 0
IV.RUFI.EHZ. 2023-09-21T09:12:09.53 0.6 undecidable manual S 223 12.4764 124 0.03 50
IV.BOSL.HHE. 2023-09-21T09:12:08.66 0.1 undecidable manual P 273 19.2696 113 0.17 95
IV.SFI.HNE. 2023-09-21T09:12:08.38 0.1 undecidable manual P 96 18.5703 114 0.03 98
IT.MRR.HGN. 2023-09-21T09:12:08.00 0.1 undecidable manual P 356 15.873 118 0.13 97
IV.VMGN.HHZ. 2023-09-21T09:12:08.16 0.6 undecidable manual S 299 7.5813 138 -0.03 50
IV.LMD.HHN. 2023-09-21T09:12:08.48 0.1 undecidable manual P 23 18.87 114 0.08 97
IV.RUFI.EHZ. 2023-09-21T09:12:07.41 0.6 undecidable manual P 223 12.4764 124 0.12 49
IV.RINC.EHZ. 2023-09-21T09:12:07.08 0.6 undecidable manual S 190 3.8961 155 -0.4 47
IV.VMGN.HHZ. 2023-09-21T09:12:06.69 0.1 negative manual P 299 7.5813 138 0.16 97
IV.RINC.EHZ. 2023-09-21T09:12:06.06 0.1 negative manual P 190 3.8961 155 -0.06 100
IV.RIBO.EHZ.01 2023-09-21T09:12:06.14 3.0 negative manual Pn -0.6 0
IV.ARVD.HHZ. 2023-09-21T09:12:02.79 3.0 negative manual P -0.85 0
IV.MOMA.HHZ. 2023-09-21T09:12:01.72 3.0 positive manual P -0.04 0
IV.ATFO.HHZ. 2023-09-21T09:11:59.43 3.0 undecidable manual P -0.1 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RINC.EHE. ML:0.0 0.0024057905000000003 0.16 AML other m 2023-09-21T09:12:07.47
IV.RINC.EHN. ML:0.0 0.003180395 0.1152 AML other m 2023-09-21T09:12:07.33
IV.VMGN.HHE. ML:1.7 0.0009216307999999999 0.1216 AML other m 2023-09-21T09:12:08.22
IV.RUFI.EHN. ML:0.0 0.00028206644999999997 0.2624 AML other m 2023-09-21T09:12:09.81
IV.VMGN.HHN. ML:1.2 0.000253 0.32 AML other m 2023-09-21T09:12:09.99
IV.RUFI.EHE. ML:0.0 0.0000739939 0.2432 AML other m 2023-09-21T09:12:10.89
IV.ATFO.HHE. ML:1.2 0.000017099084 0.4416 AML other m 2023-09-21T09:12:04.60
IV.ATFO.HHN. ML:1.2 0.000015468585 0.32 AML other m 2023-09-21T09:12:08.20
IV.ATFO.HNE. ML:2.1 0.00012794055 0.5184 AML other m 2023-09-21T09:12:15.87
IV.ATFO.HNN. ML:2.0 0.00009420423 0.4544 AML other m 2023-09-21T09:12:12.90
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