Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 18-11-2023 and time 21:59:56 (UTC) in region 5 km W Portico e San Benedetto (FC)

A magnitude ML 0.4 earthquake occured in region: 5 km W Portico e San Benedetto (FC), on

  • 18-11-2023 21:59:56 (UTC)
  • 18-11-2023 22:59:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0100, 11.7290 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
Portico e San Benedetto FC 5 756 756
Premilcuore FC 5 799 1555
Tredozio FC 8 1212 2767
Rocca San Casciano FC 11 1910 4677
Marradi FI 12 3139 7816
San Godenzo FI 13 1167 8983
Galeata FC 15 2516 11499
Santa Sofia FC 16 4136 15635
Civitella di Romagna FC 17 3786 19421
Modigliana FC 17 4560 23981
Dovadola FC 18 1653 25634
Palazzuolo sul Senio FI 19 1154 26788

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
35 Km SW of Forlì (117913 inhabitants)
38 Km S of Imola (69797 inhabitants)
43 Km W of Cesena (96758 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
53 Km E of Prato (191150 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
62 Km N of Arezzo (99543 inhabitants)
62 Km SE of Bologna (386663 inhabitants)
65 Km E of Pistoia (90315 inhabitants)
67 Km W of Rimini (147750 inhabitants)
83 Km NE of Siena (53903 inhabitants)
92 Km S of Ferrara (133155 inhabitants)
95 Km SE of Modena (184973 inhabitants)
96 Km W of Pesaro (94582 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 0.4 2023-11-18
21:59:56		 44.0098 11.7293 10 2023-11-18
22:22:39		 Sala Sismica INGV-Roma 123240471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-11-18 21:59:56 ± 0.05
Latitude 44.0098 ± 0.0027
Longitude 11.7293 ± 0.0038
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 123240471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 277
Semi-minor axis of confidence ellipse (meter) 224
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 99
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.42268
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 123240471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-11-18 22:22:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-11-18T22:00:12.37 0.6 undecidable manual S 158 46.9197 50 0.38 44
MN.TRI.HHZ. 2023-11-18T22:00:07.65 3.0 positive manual Pn -0.62 0
IV.RUFI.EHZ. 2023-11-18T22:00:06.03 0.6 undecidable manual S 223 25.9518 110 -0.19 47
IV.CRE.HHZ. 2023-11-18T22:00:05.42 0.3 undecidable manual P 158 46.9197 50 -0.08 70
IV.MF5.EHZ. 2023-11-18T22:00:04.31 3.0 undecidable manual P -9.99 0
IT.MOG.HNE. 2023-11-18T22:00:03.89 1.0 undecidable manual S 10 18.0708 118 0.17 24
IV.RINC.EHZ. 2023-11-18T22:00:03.41 0.6 undecidable manual S 216 16.7721 119 0.07 49
IV.VMGN.HHZ. 2023-11-18T22:00:03.55 0.6 undecidable manual S 249 16.872 119 0.19 48
IV.SFI.EHZ. 2023-11-18T22:00:02.63 0.6 undecidable manual S 141 14.9739 122 -0.15 49
IV.RUFI.EHZ. 2023-11-18T22:00:02.12 0.6 undecidable manual P 223 25.9518 110 -0.06 49
IV.VISG.HHZ. 2023-11-18T22:00:02.84 0.1 undecidable manual P 310 30.747 50 -0.18 94
IV.VMGN.HHZ. 2023-11-18T22:00:00.65 1.0 positive manual P 249 16.872 119 0.13 24
IV.SFI.EHZ. 2023-11-18T22:00:00.15 0.1 undecidable manual P 141 14.9739 122 -0.04 100
IT.MOG.HNE. 2023-11-18T22:00:00.77 0.1 undecidable manual P 10 18.0708 118 0.04 99
IV.RINC.EHZ. 2023-11-18T22:00:00.51 0.1 undecidable manual P 216 16.7721 119 0 100
IT.MRR.HGN. 2023-11-18T21:59:59.73 0.6 undecidable manual P 301 11.6772 129 0.06 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:0.3 0.000009505 1.16 AML other m 2023-11-18T22:00:10.39
IV.VISG.HHN. ML:0.5 0.000016285 0.42 AML other m 2023-11-18T22:00:14.33
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