Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 20-09-2023 and time 09:42:38 (Italy) in region 3 km E Marradi (FI)

A magnitude ML 2.0 earthquake occured in region: 3 km E Marradi (FI), on

  • 20-09-2023 07:42:38 (UTC)
  • 20-09-2023 09:42:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0840, 11.6440 at 6 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 3 3139 3139
Tredozio FC 8 1212 4351
Palazzuolo sul Senio FI 8 1154 5505
Portico e San Benedetto FC 13 756 6261
Modigliana FC 14 4560 10821
Casola Valsenio RA 16 2617 13438
Premilcuore FC 16 799 14237
Rocca San Casciano FC 16 1910 16147
San Godenzo FI 18 1167 17314
Castel del Rio BO 18 1246 18560
Brisighella RA 18 7639 26199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Faenza (58541 inhabitants)
31 Km S of Imola (69797 inhabitants)
35 Km W of Forlì (117913 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
60 Km E of Pistoia (90315 inhabitants)
71 Km N of Arezzo (99543 inhabitants)
74 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
85 Km SE of Modena (184973 inhabitants)
89 Km N of Siena (53903 inhabitants)
95 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 2023-09-20
07:42:38		 44.0838 11.6445 7 2023-09-20
07:59:36		 Sala Sismica INGV-Roma 121265131
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 07:42:38 ± 0.08
Latitude 44.0838 ± 0.0045
Longitude 11.6445 ± 0.0063
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121265131

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 477
Semi-minor axis of confidence ellipse (meter) 148
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 166
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 53
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78960
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 20
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 121265131
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 07:59:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHZ. 2023-09-20T07:43:37.49 3.0 undecidable manual Sn 1.77 0
IV.FDMO.HHZ. 2023-09-20T07:43:25.33 3.0 undecidable manual S -0.1 0
IV.CAFI.HHZ. 2023-09-20T07:43:05.73 0.6 undecidable manual S 163 87.6456 50 0.85 34
IV.PARC.HHZ. 2023-09-20T07:43:00.15 0.6 undecidable manual S 135 67.7766 50 0.57 39
IV.CAFI.HHZ. 2023-09-20T07:42:53.73 1.0 undecidable manual P 163 87.6456 50 0.2 21
IV.PARC.HHZ. 2023-09-20T07:42:51.65 0.6 undecidable manual P 135 67.7766 50 1.18 30
IV.MOCL.EHZ. 2023-09-20T07:42:51.37 0.3 undecidable manual S 257 38.0286 100 -0.04 71
IV.CRMI.HHZ. 2023-09-20T07:42:49.64 1.0 negative manual P 239 61.9935 50 0.05 23
IV.BOSL.HHZ. 2023-09-20T07:42:48.29 0.6 undecidable manual S 232 27.4503 103 0.48 44
IV.PSL.EHZ. 2023-09-20T07:42:48.43 0.1 undecidable manual P 262 57.6978 50 -0.5 83
IV.CRE.HHZ. 2023-09-20T07:42:48.16 0.1 undecidable manual P 154 57.0984 50 -0.68 77
IV.RUFI.EHZ. 2023-09-20T07:42:48.57 0.6 undecidable manual S 202 29.3484 103 0.12 47
IV.SFI.EHZ. 2023-09-20T07:42:47.14 0.6 undecidable manual S 141 25.5522 104 -0.05 48
IV.MPPT.EHZ. 2023-09-20T07:42:46.79 0.1 undecidable manual P 253 46.4202 50 -0.39 87
IV.RINC.EHZ. 2023-09-20T07:42:46.18 0.6 undecidable manual S 188 22.0668 106 0.16 47
IV.FNVD.HHZ. 2023-09-20T07:42:46.05 0.3 undecidable manual P 283 42.5241 50 -0.54 63
IV.SEI.HHZ. 2023-09-20T07:42:46.42 0.6 undecidable manual S 262 23.0547 106 0.09 48
IV.MOCL.EHZ. 2023-09-20T07:42:45.29 1.0 undecidable manual P 257 38.0286 100 -0.46 22
IV.IMOL.EHZ. 2023-09-20T07:42:45.11 0.3 undecidable manual P 14 31.5462 102 0.62 62
IV.VISG.HHZ. 2023-09-20T07:42:45.67 0.6 undecidable manual S 305 20.3685 108 0.21 47
IV.MTRZ.HHZ. 2023-09-20T07:42:44.86 0.1 undecidable manual P 326 30.8469 102 0.52 86
IV.VMGN.HHZ. 2023-09-20T07:42:44.72 0.6 undecidable manual S 212 16.872 111 0.41 45
IT.MOG.HNE. 2023-09-20T07:42:43.08 0.6 undecidable manual S 45 13.6752 115 -0.2 48
IV.RUFI.EHZ. 2023-09-20T07:42:43.77 0.1 undecidable manual P 202 29.3484 103 -0.28 91
IV.SFI.EHZ. 2023-09-20T07:42:43.06 0.6 positive manual P 141 25.5522 104 -0.26 46
IV.BOSL.HHZ. 2023-09-20T07:42:43.73 0.1 positive manual P 232 27.4503 103 0.05 96
IV.SEI.HHZ. 2023-09-20T07:42:42.76 0.1 positive manual P 262 23.0547 106 -0.06 97
IV.VISG.HHZ. 2023-09-20T07:42:42.36 0.1 undecidable manual P 305 20.3685 108 0.04 97
IV.RINC.EHZ. 2023-09-20T07:42:42.68 0.6 positive manual P 188 22.0668 106 0.04 49
IT.MOG.HNE. 2023-09-20T07:42:41.17 0.1 undecidable manual P 45 13.6752 115 0.11 97
IV.VMGN.HHZ. 2023-09-20T07:42:41.89 0.1 positive manual P 212 16.872 111 0.24 94
IT.MRR.HGN. 2023-09-20T07:42:40.48 0.6 undecidable manual S 236 3.996 149 -0.19 49
IV.LMD.HHZ. 2023-09-20T07:42:40.47 0.6 undecidable manual S 98 5.0949 142 -0.42 46
IV.LMD.HHZ. 2023-09-20T07:42:39.41 0.1 undecidable manual P 98 5.0949 142 -0.27 95
IT.MRR.HGN. 2023-09-20T07:42:39.50 0.1 undecidable manual P 236 3.996 149 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:1.8 0.0006885 0.48 AML other m 2023-09-20T07:42:45.39
IV.SEI.HHN. ML:2.8 0.00472 0.26 AML other m 2023-09-20T07:42:47.18
IV.SFI.EHE. ML:2.1 0.0007015 0.7 AML other m 2023-09-20T07:42:47.31
IV.SFI.HNE. ML:2.0 0.0006630000000000001 0.7 AML other m 2023-09-20T07:42:47.31
IV.VMGN.HHN. ML:2.0 0.0009040000000000001 0.66 AML other m 2023-09-20T07:42:47.34
IV.RINC.EHE. ML:2.2 0.001094 1.46 AML other m 2023-09-20T07:42:47.08
IV.SFI.EHN. ML:2.1 0.000777 0.1 AML other m 2023-09-20T07:42:47.87
IV.SFI.HNN. ML:2.1 0.0007689999999999999 0.1 AML other m 2023-09-20T07:42:47.92
IV.BOSL.HHE. ML:1.6 0.000245 1.24 AML other m 2023-09-20T07:42:48.76
IV.BOSL.HHN. ML:1.7 0.00030100000000000005 0.34 AML other m 2023-09-20T07:42:48.76
IV.RUFI.EHE. ML:1.5 0.0001535 0.3 AML other m 2023-09-20T07:42:48.71
IV.RUFI.EHN. ML:2.0 0.0005329999999999999 0.44 AML other m 2023-09-20T07:42:48.69
IV.SEI.HHE. ML:2.4 0.001865 0.42 AML other m 2023-09-20T07:42:49.40
IV.RINC.EHN. ML:2.2 0.0010934999999999999 1.02 AML other m 2023-09-20T07:42:49.00
IV.MOCL.EHE. ML:2.1 0.0004555 0.18 AML other m 2023-09-20T07:42:51.73
IV.MOCL.EHN. ML:2.2 0.0006154999999999999 0.14 AML other m 2023-09-20T07:42:51.87
IV.MTRZ.HNE. ML:2.2 0.0007775 0.6 AML other m 2023-09-20T07:42:52.16
IV.MTRZ.HHE. ML:2.2 0.0007875 0.6 AML other m 2023-09-20T07:42:52.16
IV.IMOL.HNN. ML:2.3 0.0009965 0.2 AML other m 2023-09-20T07:42:52.88
IV.IMOL.HNE. ML:2.1 0.000637 0.2 AML other m 2023-09-20T07:42:53.22
IV.MTRZ.HNN. ML:2.1 0.0006875 0.74 AML other m 2023-09-20T07:42:54.51
IV.MTRZ.HHN. ML:2.2 0.0008029999999999999 0.46 AML other m 2023-09-20T07:42:54.51
IV.FNVD.HHE. ML:2.2 0.00048450000000000007 1.58 AML other m 2023-09-20T07:42:54.98
IV.FNVD.HHN. ML:1.5 0.00011 0.42 AML other m 2023-09-20T07:42:56.92
IV.CRE.HHN. ML:2.5 0.0006925 1.78 AML other m 2023-09-20T07:42:56.99
IV.CRE.HHE. ML:2.3 0.0004195 0.28 AML other m 2023-09-20T07:42:57.11
IV.MPPT.EHN. ML:1.7 0.00014199999999999998 1.7 AML other m 2023-09-20T07:42:58.85
IV.MPPT.EHE. ML:1.7 0.000153 0.48 AML other m 2023-09-20T07:42:58.62
IV.CRMI.HHN. ML:1.8 0.00011649999999999999 0.32 AML other m 2023-09-20T07:42:58.70
IV.CRMI.HHE. ML:1.4 0.0000459 0.32 AML other m 2023-09-20T07:42:58.83
IV.PARC.HHE. ML:1.6 0.00007455000000000001 0.32 AML other m 2023-09-20T07:43:06.87
IV.PARC.HHN. ML:1.7 0.00009154999999999999 0.98 AML other m 2023-09-20T07:43:06.98
IV.CAFI.HHE. ML:1.9 0.00009265000000000002 1.36 AML other m 2023-09-20T07:43:07.86
IV.CAFI.HHN. ML:1.7 0.00006739999999999998 0.42 AML other m 2023-09-20T07:43:09.69
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