Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 19-09-2023 and time 12:23:35 (Italy) in region 3 km E Marradi (FI)

A magnitude ML 1.7 earthquake occured in region: 3 km E Marradi (FI), on

  • 19-09-2023 10:23:35 (UTC)
  • 19-09-2023 12:23:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0820, 11.6520 at 7 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 7 1212 4351
Palazzuolo sul Senio FI 9 1154 5505
Portico e San Benedetto FC 12 756 6261
Modigliana FC 14 4560 10821
Premilcuore FC 15 799 11620
Rocca San Casciano FC 15 1910 13530
Casola Valsenio RA 16 2617 16147
San Godenzo FI 17 1167 17314
Brisighella RA 18 7639 24953
Castel del Rio BO 19 1246 26199
Dovadola FC 19 1653 27852

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 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)
50 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)
61 Km E of Pistoia (90315 inhabitants)
71 Km N of Arezzo (99543 inhabitants)
73 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
85 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 inhabitants)
96 Km E of Lucca (89046 inhabitants)
99 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 1.7 2023-09-19
10:23:35		 44.0815 11.6522 7 2023-09-19
10:33:44		 Sala Sismica INGV-Roma 121228031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-19 10:23:35 ± 0.08
Latitude 44.0815 ± 0.0036
Longitude 11.6522 ± 0.0050
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 121228031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 412
Semi-minor axis of confidence ellipse (meter) 207
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) 410.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.03957
Epicentral distance of station farthest from the epicenter (degree) 0.78511
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 121228031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-19 10:33:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-09-19T10:23:54.24 0.6 undecidable manual S 155 56.5989 50 -0.05 47
IV.CAFI.HHZ. 2023-09-19T10:23:51.70 0.3 undecidable manual P 163 87.1461 50 0.48 60
IV.MOCL.EHZ. 2023-09-19T10:23:49.29 0.6 undecidable manual S 257 38.5281 50 -0.16 47
IV.CRE.HHZ. 2023-09-19T10:23:46.19 0.1 undecidable manual P 155 56.5989 50 -0.32 88
IV.RUFI.EHZ. 2023-09-19T10:23:46.48 0.3 undecidable manual S 203 29.3484 104 0.1 73
IV.BOSL.HHZ. 2023-09-19T10:23:46.20 0.6 undecidable manual S 233 27.75 105 0.34 46
IV.SFI.EHZ. 2023-09-19T10:23:45.11 0.3 undecidable manual S 142 25.0527 106 0.17 72
IV.RINC.EHZ. 2023-09-19T10:23:44.20 0.6 undecidable manual S 189 21.9669 109 0.28 47
IV.SEI.HHZ. 2023-09-19T10:23:44.57 0.6 undecidable manual S 263 23.5542 107 0.1 49
IV.VISG.HHZ. 2023-09-19T10:23:43.78 0.6 undecidable manual S 305 21.0678 109 0.15 49
IV.MOCL.EHZ. 2023-09-19T10:23:43.30 0.1 undecidable manual P 257 38.5281 50 -0.42 89
IV.IMOL.EHZ. 2023-09-19T10:23:43.15 0.3 undecidable manual P 13 31.6461 103 0.74 60
IV.VMGN.HHZ. 2023-09-19T10:23:42.88 0.6 undecidable manual S 214 16.9719 113 0.55 45
IV.SFI.EHZ. 2023-09-19T10:23:41.02 0.1 undecidable manual P 142 25.0527 106 -0.1 98
IV.BOSL.HHZ. 2023-09-19T10:23:41.64 0.1 undecidable manual P 233 27.75 105 0 99
IT.MOG.HNZ. 2023-09-19T10:23:41.53 0.6 undecidable manual S 43 13.4754 119 0.32 48
IV.RUFI.EHZ. 2023-09-19T10:23:41.76 0.1 positive manual P 203 29.3484 104 -0.19 95
IV.SEI.HHZ. 2023-09-19T10:23:40.70 0.1 positive manual P 263 23.5542 107 -0.14 97
IV.VISG.HHZ. 2023-09-19T10:23:40.30 0.1 undecidable manual P 305 21.0678 109 -0.06 99
IV.RINC.EHZ. 2023-09-19T10:23:40.59 0.1 undecidable manual P 189 21.9669 109 0.06 99
IV.VMGN.HHZ. 2023-09-19T10:23:39.83 0.1 positive manual P 214 16.9719 113 0.22 97
IT.MOG.HNZ. 2023-09-19T10:23:39.07 0.1 undecidable manual P 43 13.4754 119 0.11 99
IT.MRR.HGZ. 2023-09-19T10:23:38.47 0.6 undecidable manual S 244 4.3956 150 -0.4 48
IV.LMD.HHZ. 2023-09-19T10:23:38.47 0.3 undecidable manual S 96 4.3956 149 -0.41 71
IT.MRR.HGZ. 2023-09-19T10:23:37.45 0.1 undecidable manual P 244 4.3956 150 -0.16 100
IV.LMD.HHZ. 2023-09-19T10:23:37.36 0.1 undecidable manual P 96 4.3956 149 -0.25 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:1.5 0.00027649999999999994 0.42 AML other m 2023-09-19T10:23:43.31
IV.VISG.HHN. ML:1.3 0.00015900000000000002 0.12 AML other m 2023-09-19T10:23:44.26
IV.SEI.HHN. ML:2.4 0.0017749999999999999 0.28 AML other m 2023-09-19T10:23:45.09
IV.SFI.HNE. ML:1.7 0.0003055 0.72 AML other m 2023-09-19T10:23:45.20
IV.SFI.EHE. ML:1.7 0.0002935 0.72 AML other m 2023-09-19T10:23:45.20
IV.VMGN.HHN. ML:1.6 0.00035499999999999996 0.68 AML other m 2023-09-19T10:23:45.25
IV.RINC.EHE. ML:1.8 0.000462 1.42 AML other m 2023-09-19T10:23:45.00
IV.SFI.HNN. ML:1.8 0.0003555 0.1 AML other m 2023-09-19T10:23:45.77
IV.SFI.EHN. ML:1.8 0.0003625 0.1 AML other m 2023-09-19T10:23:45.82
IV.VISG.HHE. ML:1.3 0.0001365 0.9 AML other m 2023-09-19T10:23:46.52
IV.BOSL.HHE. ML:1.3 0.00010139999999999998 1.24 AML other m 2023-09-19T10:23:46.67
IV.BOSL.HHN. ML:1.3 0.00012095 0.36 AML other m 2023-09-19T10:23:46.68
IV.SEI.HHE. ML:1.9 0.0005840000000000001 0.3 AML other m 2023-09-19T10:23:47.31
IV.RINC.EHN. ML:1.7 0.000384 1.64 AML other m 2023-09-19T10:23:48.92
IV.MOCL.EHE. ML:1.7 0.000176 0.18 AML other m 2023-09-19T10:23:49.65
IV.MOCL.EHN. ML:1.9 0.000286 0.16 AML other m 2023-09-19T10:23:49.87
IV.CRE.HHN. ML:2.1 0.000263 1.8 AML other m 2023-09-19T10:23:54.90
IV.CRE.HHE. ML:1.8 0.0001615 0.28 AML other m 2023-09-19T10:23:55.02
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