Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.4 on date 20-09-2023 and time 15:27:15 (Italy) in region 6 km SW Tredozio (FC)

A magnitude ML 2.4 earthquake occured in region: 6 km SW Tredozio (FC), on

  • 20-09-2023 13:27:15 (UTC)
  • 20-09-2023 15:27:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0430, 11.6830 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
Tredozio FC 6 1212 1212
Marradi FI 7 3139 4351
Portico e San Benedetto FC 8 756 5107
Premilcuore FC 11 799 5906
Rocca San Casciano FC 13 1910 7816
Palazzuolo sul Senio FI 13 1154 8970
San Godenzo FI 14 1167 10137
Modigliana FC 16 4560 14697
Dovadola FC 19 1653 16350
Galeata FC 19 2516 18866

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
35 Km S of Imola (69797 inhabitants)
35 Km SW of Forlì (117913 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
46 Km W of Cesena (96758 inhabitants)
50 Km E of Prato (191150 inhabitants)
51 Km NE of Scandicci (50609 inhabitants)
57 Km SE of Bologna (386663 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
66 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
85 Km NE of Siena (53903 inhabitants)
88 Km S of Ferrara (133155 inhabitants)
90 Km SE of Modena (184973 inhabitants)
97 Km E of Lucca (89046 inhabitants)
100 Km W of Pesaro (94582 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 2.4 2023-09-20
13:27:15		 44.0432 11.6828 8 2023-09-20
13:39:04		 Sala Sismica INGV-Roma 121277931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 13:27:15 ± 0.05
Latitude 44.0432 ± 0.0027
Longitude 11.6828 ± 0.0038
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 121277931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 281
Semi-minor axis of confidence ellipse (meter) 212
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 106
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 49
Number of associated phases, regardless of their use for origin computation 63
Number of defining phases 37
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78781
Number of stations at which the event was observed 50
Number of stations from which data was used for origin computation 25
Magnitude information

ML:2.4

Field Value
Value 2.4
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 121277931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 13:39:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RNI2.HHZ. 2023-09-20T13:28:52.09 3.0 undecidable manual Sg 13.43 0
IV.MIDA.HHZ. 2023-09-20T13:28:39.15 3.0 undecidable manual Sn -1.82 0
OX.CIMO.HHZ. 2023-09-20T13:28:22.61 3.0 undecidable manual Sn -1.13 0
IV.LPEL.HHZ. 2023-09-20T13:28:09.04 3.0 undecidable manual Pg 10.39 0
SI.ABSI.HHZ. 2023-09-20T13:28:00.06 3.0 positive manual Pn 1.32 0
NI.VINO.HHZ. 2023-09-20T13:27:55.37 3.0 positive manual Pn -0.37 0
SI.LUSI.HHZ. 2023-09-20T13:27:53.15 3.0 positive manual Pg 4.17 0
IV.STAL.HHZ. 2023-09-20T13:27:53.89 3.0 negative manual Pn 0.17 0
OX.MLN.HHZ. 2023-09-20T13:27:51.74 3.0 negative manual Pn -0.26 0
IV.MMO1.EHZ. 2023-09-20T13:27:49.46 3.0 positive manual Pg 5.27 0
ST.DOSS.HHZ. 2023-09-20T13:27:48.04 3.0 positive manual Pn 0.64 0
IV.MAGA.HHZ. 2023-09-20T13:27:48.88 3.0 positive manual Pn 1.26 0
OX.VARN.HHZ. 2023-09-20T13:27:48.64 3.0 undecidable manual Pn -0.13 0
IV.ROVR.HHZ. 2023-09-20T13:27:47.13 3.0 negative manual Pg 2.61 0
IV.PIEI.HHZ. 2023-09-20T13:27:43.44 3.0 undecidable manual S -0.23 0
IV.ZOVE.EHZ. 2023-09-20T13:27:41.61 3.0 positive manual P 0.44 0
IV.CASP.HHZ. 2023-09-20T13:27:40.45 3.0 negative manual P -0.04 0
IV.MOMA.HHZ. 2023-09-20T13:27:40.41 3.0 undecidable manual P -0.21 0
GU.GRAM.HHZ. 2023-09-20T13:27:39.31 3.0 positive manual P 0.56 0
IV.MGAB.HHZ. 2023-09-20T13:27:38.39 3.0 positive manual P 0.86 0
IV.CRMI.HHZ. 2023-09-20T13:27:35.24 1.0 undecidable manual S 244 62.5929 50 0.14 22
MN.VLC.HHZ. 2023-09-20T13:27:34.50 3.0 positive manual P 0.46 0
IV.MPAG.EHZ. 2023-09-20T13:27:33.06 3.0 negative manual P 0.29 0
GU.MAIM.HHZ. 2023-09-20T13:27:32.83 3.0 positive manual P 0.17 0
IV.NARO.HHZ. 2023-09-20T13:27:31.94 3.0 undecidable manual P 1.07 0
IV.ATPI.EHZ. 2023-09-20T13:27:30.72 1.0 undecidable manual P 138 87.4458 50 0.19 21
IV.PIEI.HHZ. 2023-09-20T13:27:30.60 3.0 undecidable manual P -0.6 0
IV.CAFI.HHZ. 2023-09-20T13:27:30.09 0.3 positive manual P 164 82.3509 50 0.34 62
GU.POPM.HHZ. 2023-09-20T13:27:29.59 3.0 positive manual P 0.64 0
IV.BADI.EHZ. 2023-09-20T13:27:28.25 0.6 negative manual P 143 74.37 50 -0.26 43
IV.MOCL.EHZ. 2023-09-20T13:27:28.89 0.6 undecidable manual S 264 40.2264 50 -0.26 45
IV.OSSC.HHZ. 2023-09-20T13:27:27.56 0.6 positive manual P 211 67.377 50 0.11 44
IV.CSNT.HHZ. 2023-09-20T13:27:27.89 0.6 positive manual P 207 70.5738 50 -0.05 45
IV.CRMI.HHZ. 2023-09-20T13:27:26.62 0.6 undecidable manual P 244 62.5929 50 -0.07 45
IV.PARC.HHZ. 2023-09-20T13:27:26.13 1.0 undecidable manual P 134 62.3931 50 -0.54 20
IV.RSM2.HHZ. 2023-09-20T13:27:26.82 1.0 undecidable manual P 101 61.9935 50 0.22 22
IV.BOSL.HHZ. 2023-09-20T13:27:25.15 0.6 undecidable manual S 243 27.5502 106 0 49
IV.BRSN.HNE. 2023-09-20T13:27:24.00 1.0 undecidable manual P 50 41.4252 50 0.56 21
IV.MPPT.EHZ. 2023-09-20T13:27:24.33 0.6 negative manual P 259 48.2184 50 -0.16 46
IV.RUFI.EHZ. 2023-09-20T13:27:24.79 0.6 undecidable manual S 211 26.6511 106 -0.04 49
IV.VISG.HHZ. 2023-09-20T13:27:24.44 0.6 undecidable manual S 309 25.5522 107 -0.03 49
IV.SEI.HHZ. 2023-09-20T13:27:24.24 1.0 undecidable manual S 273 25.8519 107 -0.34 23
IV.FNVD.HHZ. 2023-09-20T13:27:24.52 0.6 undecidable manual P 287 46.7199 50 0.27 45
IV.RINC.EHZ. 2023-09-20T13:27:22.42 0.6 undecidable manual S 199 18.3705 113 0.29 47
IV.SFI.EHZ. 2023-09-20T13:27:22.49 0.6 undecidable manual S 139 20.1687 111 -0.22 47
IV.MOCL.EHZ. 2023-09-20T13:27:22.87 0.6 negative manual P 264 40.2264 50 -0.39 44
IV.IMOL.EHZ. 2023-09-20T13:27:22.89 0.3 negative manual P 8 35.4423 102 0.42 66
IV.MTRZ.HHZ. 2023-09-20T13:27:22.85 0.6 positive manual P 326 36.2415 102 0.21 46
IT.MOG.HNZ. 2023-09-20T13:27:21.54 0.3 undecidable manual S 25 15.5733 116 0.28 71
IT.MCS.HGE. 2023-09-20T13:27:21.96 0.6 undecidable manual P 99 34.2435 103 -0.28 46
IV.VMGN.HHZ. 2023-09-20T13:27:21.58 0.3 undecidable manual S 231 15.4734 117 0.36 69
IV.SEI.HHZ. 2023-09-20T13:27:20.40 0.1 positive manual P 273 25.8519 107 -0.22 94
IV.BOSL.HHZ. 2023-09-20T13:27:20.89 0.1 positive manual P 243 27.5502 106 -0.05 97
IV.RUFI.EHZ. 2023-09-20T13:27:20.56 0.3 undecidable manual P 211 26.6511 106 -0.2 70
IV.VISG.HHZ. 2023-09-20T13:27:20.30 0.1 positive manual P 309 25.5522 107 -0.26 93
IV.RINC.EHZ. 2023-09-20T13:27:19.29 0.1 positive manual P 199 18.3705 113 0.08 98
IV.SFI.EHZ. 2023-09-20T13:27:19.36 1.0 undecidable manual P 139 20.1687 111 -0.18 24
IV.VMGN.HHZ. 2023-09-20T13:27:18.91 0.1 positive manual P 231 15.4734 117 0.23 95
IT.MOG.HNZ. 2023-09-20T13:27:18.73 0.1 undecidable manual P 25 15.5733 116 0.03 99
IT.MRR.HGZ. 2023-09-20T13:27:18.86 0.3 undecidable manual S 290 6.7932 139 0.09 75
IT.MRR.HGZ. 2023-09-20T13:27:17.33 0.1 undecidable manual P 290 6.7932 139 0.06 100
IV.LMD.HHZ. 2023-09-20T13:27:17.92 0.3 undecidable manual S 27 4.2957 151 -0.35 71
IV.LMD.HHZ. 2023-09-20T13:27:16.81 0.1 undecidable manual P 27 4.2957 151 -0.17 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHN. ML:2.7 0.005755 1.78 AML other m 2023-09-20T13:27:22.95
IV.VMGN.HHE. ML:2.6 0.0038099999999999996 1.24 AML other m 2023-09-20T13:27:22.11
IV.SFI.EHE. ML:2.5 0.002515 0.5 AML other m 2023-09-20T13:27:22.93
IV.SFI.HNE. ML:2.5 0.0024950000000000003 0.5 AML other m 2023-09-20T13:27:22.93
IV.SFI.EHN. ML:2.6 0.003385 0.54 AML other m 2023-09-20T13:27:23.08
IV.SFI.HNN. ML:2.6 0.00333 0.54 AML other m 2023-09-20T13:27:23.08
IV.RINC.EHE. ML:2.7 0.00387 1.34 AML other m 2023-09-20T13:27:23.08
IV.RINC.EHN. ML:2.8 0.00491 0.7 AML other m 2023-09-20T13:27:24.55
IV.SEI.HHN. ML:3.2 0.010899999999999998 1.74 AML other m 2023-09-20T13:27:25.94
IV.VISG.HHE. ML:2.3 0.0012200000000000002 1.26 AML other m 2023-09-20T13:27:25.34
IV.SEI.HHE. ML:3.0 0.005595 0.34 AML other m 2023-09-20T13:27:25.30
IV.BOSL.HHN. ML:2.2 0.0009795000000000001 0.46 AML other m 2023-09-20T13:27:25.59
IV.VISG.HHN. ML:2.5 0.00174 0.16 AML other m 2023-09-20T13:27:26.08
IV.BOSL.HHE. ML:2.0 0.0005660000000000001 0.94 AML other m 2023-09-20T13:27:27.51
IV.MOCL.EHN. ML:2.7 0.0019299999999999999 0.16 AML other m 2023-09-20T13:27:29.35
IV.IMOL.EHE. ML:2.5 0.0013305 0.16 AML other m 2023-09-20T13:27:30.52
IV.IMOL.HNE. ML:2.8 0.0029050000000000005 0.18 AML other m 2023-09-20T13:27:30.89
IV.IMOL.HNN. ML:2.7 0.002215 1.78 AML other m 2023-09-20T13:27:31.90
IV.MTRZ.HNE. ML:2.8 0.0026950000000000003 0.44 AML other m 2023-09-20T13:27:31.49
IV.MTRZ.HHN. ML:2.9 0.00342 0.34 AML other m 2023-09-20T13:27:31.56
IV.MTRZ.HNN. ML:2.9 0.00326 0.34 AML other m 2023-09-20T13:27:31.57
IV.MOCL.EHE. ML:2.5 0.0010025 1.14 AML other m 2023-09-20T13:27:32.15
IV.MTRZ.HHE. ML:2.8 0.002815 1.28 AML other m 2023-09-20T13:27:33.94
IV.FNVD.HHN. ML:2.1 0.00034050000000000004 0.72 AML other m 2023-09-20T13:27:33.41
IV.FNVD.HHE. ML:2.5 0.000979 0.38 AML other m 2023-09-20T13:27:34.31
IV.IMOL.EHN. ML:2.2 0.000669 0.42 AML other m 2023-09-20T13:27:34.56
IV.MPPT.EHE. ML:2.1 0.00032950000000000004 0.42 AML other m 2023-09-20T13:27:34.41
IV.MPPT.EHN. ML:2.3 0.0005960000000000001 0.44 AML other m 2023-09-20T13:27:34.71
IV.CRMI.HHN. ML:2.4 0.0004385 0.5 AML other m 2023-09-20T13:27:38.56
IV.CRMI.HHE. ML:2.1 0.000245 0.42 AML other m 2023-09-20T13:27:38.63
IV.OSSC.HHE. ML:2.6 0.0007125 0.58 AML other m 2023-09-20T13:27:40.44
IV.OSSC.HHN. ML:2.5 0.000618 0.62 AML other m 2023-09-20T13:27:40.51
GU.POPM.HHE. ML:2.3 0.0002915 0.82 AML other m 2023-09-20T13:27:41.46
IV.CSNT.HHE. ML:2.5 0.000582 1.14 AML other m 2023-09-20T13:27:41.97
IV.CSNT.HHN. ML:2.7 0.000893 0.72 AML other m 2023-09-20T13:27:41.89
IV.PARC.HHE. ML:2.1 0.00023249999999999999 1.34 AML other m 2023-09-20T13:27:41.77
IV.PARC.HHN. ML:2.3 0.00035950000000000006 0.46 AML other m 2023-09-20T13:27:41.81
GU.POPM.HHN. ML:2.5 0.0005045 0.78 AML other m 2023-09-20T13:27:42.71
IV.BADI.EHN. ML:2.2 0.00023199999999999997 0.6 AML other m 2023-09-20T13:27:42.98
IV.BADI.EHE. ML:2.3 0.000299 0.58 AML other m 2023-09-20T13:27:43.10
IV.CAFI.HHE. ML:2.5 0.0003805 1.4 AML other m 2023-09-20T13:27:45.20
IV.CAFI.HHN. ML:2.2 0.0002035 0.52 AML other m 2023-09-20T13:27:45.68
IV.ATPI.EHN. ML:2.2 0.000212 0.9 AML other m 2023-09-20T13:27:46.33
GU.MAIM.HHE. ML:2.0 0.0001175 0.86 AML other m 2023-09-20T13:27:48.92
IV.NARO.HHE. ML:1.9 0.00009115 0.56 AML other m 2023-09-20T13:27:48.65
GU.MAIM.HHN. ML:2.0 0.000117 0.48 AML other m 2023-09-20T13:27:49.50
IV.NARO.HHN. ML:2.0 0.000115 0.32 AML other m 2023-09-20T13:27:51.38
IV.MPAG.EHN. ML:2.4 0.000243 0.84 AML other m 2023-09-20T13:27:52.80
IV.ATPI.EHE. ML:2.1 0.000147 0.8 AML other m 2023-09-20T13:27:53.23
IV.PIEI.HHE. ML:2.0 0.0001295 0.96 AML other m 2023-09-20T13:27:55.55
IV.MPAG.EHE. ML:2.1 0.000129 0.34 AML other m 2023-09-20T13:27:55.68
IV.PIEI.HHN. ML:1.8 0.0000854 0.3 AML other m 2023-09-20T13:27:57.64
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