Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.0 on date 18-09-2023 and time 03:17:27 (UTC) in region 1 km SE Marradi (FI)

A magnitude Md 2.0 earthquake occured in region: 1 km SE Marradi (FI), on

  • 18-09-2023 03:17:27 (UTC)
  • 18-09-2023 05:17:27 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0740, 11.6190 at 10 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 10 1212 5505
Portico e San Benedetto FC 14 756 6261
San Godenzo FI 16 1167 7428
Premilcuore FC 17 799 8227
Modigliana FC 17 4560 12787
Casola Valsenio RA 17 2617 15404
Rocca San Casciano FC 18 1910 17314
Castel del Rio BO 18 1246 18560
Vicchio FI 20 8044 26604
Firenzuola FI 20 4726 31330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
38 Km W of Forlì (117913 inhabitants)
45 Km NE of Firenze (382808 inhabitants)
47 Km E of Prato (191150 inhabitants)
50 Km NE of Scandicci (50609 inhabitants)
50 Km W of Cesena (96758 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
58 Km E of Pistoia (90315 inhabitants)
60 Km SW of Ravenna (159116 inhabitants)
71 Km NW of Arezzo (99543 inhabitants)
76 Km W of Rimini (147750 inhabitants)
84 Km SE of Modena (184973 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
87 Km N of Siena (53903 inhabitants)
93 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 		Md 2.0 2023-09-18
03:17:27		 44.0738 11.6192 10 2023-09-18
03:26:33		 Sala Sismica INGV-Roma 121148951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 03:17:27 ± 0.12
Latitude 44.0738 ± 0.0045
Longitude 11.6192 ± 0.0075
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121148951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 650
Semi-minor axis of confidence ellipse (meter) 317
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 650.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 185
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.13400
Epicentral distance of station farthest from the epicenter (degree) 0.32196
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.0

Field Value
Value 2.0
Uncertainty 0.1
Num. used stations 5
Type of magnitude Md
Reference to an origin 121148951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 03:26:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOCL.EHZ. 2023-09-18T03:17:39.77 0.1 undecidable manual S 258 35.742 50 0.27 92
IV.SFI.EHZ. 2023-09-18T03:17:37.07 0.1 undecidable manual S 136 26.1516 50 0.14 96
IV.RUFI.EHZ. 2023-09-18T03:17:36.91 0.1 undecidable manual S 199 27.5502 50 -0.4 90
IV.BOSL.HHZ. 2023-09-18T03:17:36.87 0.1 undecidable manual S 231 25.1526 50 0.21 95
IV.SEI.HHZ. 2023-09-18T03:17:35.27 0.1 undecidable manual S 264 20.868 116 -0.17 96
IV.RINC.EHZ. 2023-09-18T03:17:35.77 0.1 undecidable manual S 183 20.7681 117 0.36 92
IV.VISG.HHZ. 2023-09-18T03:17:35.15 0.1 undecidable manual S 311 19.4694 118 0.14 97
IV.MOCL.EHZ. 2023-09-18T03:17:34.42 0.6 undecidable manual P 258 35.742 50 0.06 48
IV.VMGN.HHZ. 2023-09-18T03:17:33.58 0.1 undecidable manual S 208 14.874 125 -0.07 99
IV.RUFI.EHZ. 2023-09-18T03:17:32.27 1.0 negative manual P 199 27.5502 50 -0.83 19
IV.BOSL.HHZ. 2023-09-18T03:17:32.69 0.6 positive manual P 231 25.1526 50 -0.03 49
IV.SFI.EHZ. 2023-09-18T03:17:32.74 0.3 negative manual P 136 26.1516 50 -0.14 72
IV.RINC.EHZ. 2023-09-18T03:17:32.00 0.1 negative manual P 183 20.7681 117 0 99
IV.VISG.HHZ. 2023-09-18T03:17:31.69 0.1 positive manual P 311 19.4694 118 -0.08 98
IV.SEI.HHZ. 2023-09-18T03:17:31.79 0.6 positive manual P 264 20.868 116 -0.22 48
IV.VMGN.HHZ. 2023-09-18T03:17:30.96 0.1 positive manual P 208 14.874 125 -0.03 100
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