Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 18-10-2023 and time 10:43:08 (Italy) in region 2 km SW Marradi (FI)

A magnitude ML 2.0 earthquake occured in region: 2 km SW Marradi (FI), on

  • 18-10-2023 08:43:08 (UTC)
  • 18-10-2023 10:43:08 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0640, 11.5980 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
Marradi FI 2 3139 3139
Palazzuolo sul Senio FI 7 1154 4293
Tredozio FC 12 1212 5505
San Godenzo FI 15 1167 6672
Portico e San Benedetto FC 15 756 7428
Premilcuore FC 17 799 8227
Vicchio FI 18 8044 16271
Casola Valsenio RA 18 2617 18888
Castel del Rio BO 18 1246 20134
Firenzuola FI 18 4726 24860
Modigliana FC 19 4560 29420
Rocca San Casciano FC 20 1910 31330
Dicomano FI 20 5515 36845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km S of Imola (69797 inhabitants)
34 Km SW of Faenza (58541 inhabitants)
40 Km W of Forlì (117913 inhabitants)
43 Km NE of Firenze (382808 inhabitants)
45 Km E of Prato (191150 inhabitants)
48 Km NE of Scandicci (50609 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
52 Km W of Cesena (96758 inhabitants)
56 Km E of Pistoia (90315 inhabitants)
62 Km SW of Ravenna (159116 inhabitants)
70 Km NW of Arezzo (99543 inhabitants)
77 Km W of Rimini (147750 inhabitants)
84 Km SE of Modena (184973 inhabitants)
86 Km N of Siena (53903 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
91 Km E of Lucca (89046 inhabitants)
98 Km SE of Carpi (70699 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 2.0 2023-10-18
08:43:08		 44.0637 11.5978 8 2023-10-18
08:59:53		 Sala Sismica INGV-Roma 122172761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-18 08:43:08 ± 0.07
Latitude 44.0637 ± 0.0036
Longitude 11.5978 ± 0.0038
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122172761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 341
Semi-minor axis of confidence ellipse (meter) 153
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 140
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 75
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 26
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78061
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 16
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 35
Type of magnitude ML
Reference to an origin 122172761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-18 08:59:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SBPO.HNZ. 2023-10-18T08:43:29.46 3.0 positive manual P -0.85 0
IV.CAFI.HHZ. 2023-10-18T08:43:24.16 0.1 undecidable manual P 160 86.6466 50 0.05 86
IV.PARC.HHZ. 2023-10-18T08:43:21.42 0.6 positive manual P 132 68.8755 50 0.05 45
IV.CRE.HHZ. 2023-10-18T08:43:19.18 0.1 undecidable manual P 150 56.8986 50 -0.34 86
IV.RUFI.EHZ. 2023-10-18T08:43:18.33 0.6 undecidable manual S 196 25.9518 107 -0.08 48
IV.SFI.EHZ. 2023-10-18T08:43:18.43 0.6 undecidable manual S 131 26.5512 107 -0.16 47
IV.BOSL.HHZ. 2023-10-18T08:43:17.73 0.6 undecidable manual S 231 23.1546 109 0.27 46
IV.MPPT.EHZ. 2023-10-18T08:43:17.09 0.1 undecidable manual P 254 42.2244 50 -0.16 92
IV.RINC.EHZ. 2023-10-18T08:43:16.58 0.6 undecidable manual S 178 19.6692 112 0.25 47
IT.MOG.HNE. 2023-10-18T08:43:16.19 0.3 undecidable manual S 49 17.9709 114 0.41 68
IV.SEI.HHZ. 2023-10-18T08:43:16.19 0.6 undecidable manual S 267 19.0698 113 0.03 49
IV.MOCL.EHZ. 2023-10-18T08:43:15.67 0.1 undecidable manual P 259 33.9438 103 -0.27 91
IV.MTRZ.HHZ. 2023-10-18T08:43:15.89 0.6 negative manual P 334 30.8469 105 0.54 43
IV.VISG.HHZ. 2023-10-18T08:43:15.98 0.6 undecidable manual S 317 19.0698 113 -0.16 48
IV.SFI.EHZ. 2023-10-18T08:43:14.37 0.1 negative manual P 131 26.5512 107 -0.15 95
IV.VMGN.HHZ. 2023-10-18T08:43:14.63 0.6 undecidable manual S 203 13.1757 122 0.31 47
IV.BOSL.HHZ. 2023-10-18T08:43:14.05 0.6 positive manual P 231 23.1546 109 0.19 47
IV.RUFI.EHZ. 2023-10-18T08:43:14.37 0.1 undecidable manual P 196 25.9518 107 -0.04 97
IV.SEI.HHZ. 2023-10-18T08:43:13.11 0.1 positive manual P 267 19.0698 113 0 99
IV.RINC.EHZ. 2023-10-18T08:43:13.39 0.1 positive manual P 178 19.6692 112 0.17 95
IT.MOG.HNE. 2023-10-18T08:43:13.04 0.1 undecidable manual P 49 17.9709 114 0.14 96
IV.VISG.HHZ. 2023-10-18T08:43:13.08 0.1 positive manual P 317 19.0698 113 -0.03 98
IV.LMD.HHZ. 2023-10-18T08:43:12.99 0.6 undecidable manual S 80 8.88 133 -0.13 49
IV.VMGN.HHZ. 2023-10-18T08:43:12.37 0.1 positive manual P 203 13.1757 122 0.31 94
IV.LMD.HHZ. 2023-10-18T08:43:11.39 0.1 undecidable manual P 80 8.88 133 0.03 100
IT.MRR.HGZ. 2023-10-18T08:43:11.22 0.3 undecidable manual S 82 0.3996 177 -0.55 67
IT.MRR.HGZ. 2023-10-18T08:43:10.43 0.1 undecidable manual P 82 0.3996 177 -0.15 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:2.3 0.0030600000000000002 0.12 AML other m 2023-10-18T08:43:13.13
IV.LMD.HHE. ML:2.0 0.001738601 0.1792 AML other m 2023-10-18T08:43:14.04
IV.VMGN.HHE. ML:2.0 0.001125 1.6 AML other m 2023-10-18T08:43:15.19
IV.VMGN.HHN. ML:2.1 0.0014199999999999998 0.38 AML other m 2023-10-18T08:43:15.03
IV.SEI.HHE. ML:2.4 0.001875 0.24 AML other m 2023-10-18T08:43:16.40
IV.VISG.HHE. ML:2.0 0.000884 1.08 AML other m 2023-10-18T08:43:16.05
IV.RINC.EHN. ML:2.2 0.0013050000000000002 0.36 AML other m 2023-10-18T08:43:17.58
IV.VISG.HHN. ML:2.2 0.00118 0.74 AML other m 2023-10-18T08:43:17.12
IV.BOSL.HHN. ML:1.7 0.000334 0.44 AML other m 2023-10-18T08:43:18.29
IV.RINC.EHE. ML:2.2 0.0012124999999999998 0.74 AML other m 2023-10-18T08:43:18.67
IV.BOSL.HHE. ML:1.6 0.000256 0.32 AML other m 2023-10-18T08:43:18.31
IV.SFI.HNE. ML:2.0 0.000563 0.54 AML other m 2023-10-18T08:43:18.68
IV.SFI.EHE. ML:2.0 0.0005585 0.3 AML other m 2023-10-18T08:43:18.69
IV.RUFI.EHN. ML:2.2 0.000855 0.5 AML other m 2023-10-18T08:43:18.63
IV.RUFI.EHE. ML:1.6 0.00024349999999999998 1.2 AML other m 2023-10-18T08:43:19.26
IV.SFI.EHN. ML:2.0 0.0006255 0.24 AML other m 2023-10-18T08:43:19.27
IV.SFI.HNN. ML:2.0 0.0006255 0.54 AML other m 2023-10-18T08:43:19.27
IV.SEI.HHN. ML:2.5 0.00267 1.64 AML other m 2023-10-18T08:43:20.90
IV.MOCL.EHN. ML:2.1 0.0004985 0.98 AML other m 2023-10-18T08:43:21.19
IV.MOCL.EHE. ML:1.8 0.0003045 1.34 AML other m 2023-10-18T08:43:21.15
IV.MTRZ.HHE. ML:2.2 0.0007289999999999999 1.72 AML other m 2023-10-18T08:43:23.95
IV.MTRZ.HHN. ML:2.3 0.001039 0.56 AML other m 2023-10-18T08:43:24.97
IV.MPPT.EHE. ML:1.7 0.0001575 0.42 AML other m 2023-10-18T08:43:25.48
IV.MTRZ.HNN. ML:2.5 0.001605 0.84 AML other m 2023-10-18T08:43:25.97
IV.MTRZ.HNE. ML:2.2 0.0007925 0.74 AML other m 2023-10-18T08:43:25.56
IV.MPPT.EHN. ML:1.6 0.00013350000000000002 0.9 AML other m 2023-10-18T08:43:26.65
IV.CRE.HHE. ML:2.2 0.00035299999999999996 0.18 AML other m 2023-10-18T08:43:28.06
IV.CRE.HHN. ML:2.5 0.0006540000000000001 0.18 AML other m 2023-10-18T08:43:28.09
IV.CRMI.HHN. ML:1.4 0.000058099999999999996 0.74 AML other m 2023-10-18T08:43:29.36
IV.PARC.HHN. ML:1.6 0.000059050000000000006 0.26 AML other m 2023-10-18T08:43:32.44
IV.PARC.HHE. ML:1.4 0.0000447 0.7 AML other m 2023-10-18T08:43:33.64
IV.CSNT.HHE. ML:1.7 0.0000843 0.42 AML other m 2023-10-18T08:43:33.51
IV.CSNT.HHN. ML:1.8 0.00010555 1.76 AML other m 2023-10-18T08:43:35.92
IV.CAFI.HHN. ML:1.7 0.000058450000000000005 1.08 AML other m 2023-10-18T08:43:40.98
IV.CAFI.HHE. ML:1.8 0.00007935 0.48 AML other m 2023-10-18T08:43:41.04
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
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