Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 19-09-2023 and time 16:21:04 (Italy) in region 1 km SW Marradi (FI)

A magnitude ML 0.7 earthquake occured in region: 1 km SW Marradi (FI), on

  • 19-09-2023 14:21:04 (UTC)
  • 19-09-2023 16:21:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0700, 11.6050 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 1 3139 3139
Palazzuolo sul Senio FI 7 1154 4293
Tredozio FC 11 1212 5505
Portico e San Benedetto FC 15 756 6261
San Godenzo FI 16 1167 7428
Casola Valsenio RA 17 2617 10045
Premilcuore FC 17 799 10844
Castel del Rio BO 18 1246 12090
Modigliana FC 18 4560 16650
Vicchio FI 19 8044 24694
Firenzuola FI 19 4726 29420
Rocca San Casciano FC 19 1910 31330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
33 Km S of Imola (69797 inhabitants)
39 Km W of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
46 Km E of Prato (191150 inhabitants)
48 Km NE of Scandicci (50609 inhabitants)
52 Km W of Cesena (96758 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
57 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
71 Km NW of Arezzo (99543 inhabitants)
77 Km W of Rimini (147750 inhabitants)
84 Km SE of Modena (184973 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
86 Km N of Siena (53903 inhabitants)
92 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 0.7 2023-09-19
14:21:04		 44.07 11.6048 7 2023-09-19
14:32:25		 Sala Sismica INGV-Roma 121233611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-19 14:21:04 ± 0.14
Latitude 44.0700 ± 0.0036
Longitude 11.6048 ± 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 121233611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 463
Semi-minor axis of confidence ellipse (meter) 181
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
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) 0.00630
Epicentral distance of station farthest from the epicenter (degree) 0.24192
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 121233611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-19 14:32:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RINC.EHZ. 2023-09-19T14:21:12.25 0.6 undecidable manual S 179 20.3685 110 0.64 42
IV.VISG.HHZ. 2023-09-19T14:21:11.27 0.3 undecidable manual S 314 18.9699 111 0.12 72
IT.MOG.HNE. 2023-09-19T14:21:10.85 0.6 undecidable manual S 49 17.0718 113 0.31 46
IV.VMGN.HHZ. 2023-09-19T14:21:09.74 0.3 undecidable manual S 204 14.0748 117 0.14 72
IV.RUFI.EHN. 2023-09-19T14:21:09.27 0.1 undecidable manual P 197 26.8509 105 -0.41 89
IV.SEI.HHZ. 2023-09-19T14:21:08.34 0.3 undecidable manual P 265 19.6692 110 0.02 73
IV.VISG.HHZ. 2023-09-19T14:21:08.10 0.1 undecidable manual P 314 18.9699 111 -0.07 97
IV.RINC.EHZ. 2023-09-19T14:21:08.39 0.1 undecidable manual P 179 20.3685 110 -0.05 97
IV.VMGN.HHZ. 2023-09-19T14:21:07.34 0.1 undecidable manual P 204 14.0748 117 0.06 98
IV.LMD.HHZ. 2023-09-19T14:21:07.76 0.3 undecidable manual S 84 8.1807 131 -0.15 73
IT.MOG.HNE. 2023-09-19T14:21:07.89 0.1 undecidable manual P 49 17.0718 113 0.07 97
IT.MRR.HGN. 2023-09-19T14:21:06.51 0.6 undecidable manual S 190 0.6993 175 -0.13 49
IV.LMD.HHZ. 2023-09-19T14:21:06.24 0.6 undecidable manual P 84 8.1807 131 -0.07 49
IT.MRR.HGN. 2023-09-19T14:21:05.52 0.1 undecidable manual P 190 0.6993 175 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.9 0.00015 0.12 AML other m 2023-09-19T14:21:07.84
IV.LMD.HHE. ML:0.6 0.00006905 0.16 AML other m 2023-09-19T14:21:08.73
IV.VISG.HHE. ML:0.3 0.000012722875 0.1152 AML other m 2023-09-19T14:21:11.70
IV.VISG.HHN. ML:0.6 0.000031598595 0.1152 AML other m 2023-09-19T14:21:12.10
IV.SEI.HHE. ML:0.7 0.000041479585 0.416 AML other m 2023-09-19T14:21:18.81
IV.SEI.HHN. ML:0.8 0.00005371409000000001 0.4224 AML other m 2023-09-19T14:21:13.35
IV.RINC.EHE. ML:0.5 0.000025078065 0.2432 AML other m 2023-09-19T14:21:12.58
IV.RINC.EHN. ML:0.7 0.000033529571500000004 0.9024 AML other m 2023-09-19T14:21:15.44
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