Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.3 on date 18-09-2023 and time 17:28:36 (UTC) in region 5 km W Tredozio (FC)

A magnitude ML 0.3 earthquake occured in region: 5 km W Tredozio (FC), on

  • 18-09-2023 17:28:36 (UTC)
  • 18-09-2023 19:28:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0680, 11.6850 at 5 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Tredozio FC 5 1212 1212
Marradi FI 6 3139 4351
Portico e San Benedetto FC 9 756 5107
Palazzuolo sul Senio FI 12 1154 6261
Premilcuore FC 13 799 7060
Rocca San Casciano FC 13 1910 8970
Modigliana FC 13 4560 13530
San Godenzo FI 17 1167 14697
Dovadola FC 17 1653 16350
Casola Valsenio RA 18 2617 18967
Brisighella RA 18 7639 26606
Galeata FC 20 2516 29122

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
33 Km SW of Forlì (117913 inhabitants)
45 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
88 Km NE of Siena (53903 inhabitants)
88 Km SE of Modena (184973 inhabitants)
98 Km E of Lucca (89046 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 0.3 2023-09-18
17:28:36		 44.0683 11.6848 5 2023-09-18
17:35:57		 Sala Sismica INGV-Roma 121200171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 17:28:36 ± 0.15
Latitude 44.0683 ± 0.0036
Longitude 11.6848 ± 0.0063
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121200171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 470
Semi-minor axis of confidence ellipse (meter) 145
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 288
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 86
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.21674
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.3

Field Value
Value 0.3
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 121200171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 17:35:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
ZO.PDN2.EHN. 2023-09-18T17:28:46.33 3.0 negative manual P -0.77 0
IV.VISG.HHE. 2023-09-18T17:28:44.57 0.3 undecidable manual S 304 24.0537 101 0.03 73
IV.RINC.EHZ. 2023-09-18T17:28:43.80 0.3 undecidable manual S 197 21.0678 103 0.25 70
IV.SFI.EHZ. 2023-09-18T17:28:43.95 0.3 undecidable manual S 144 22.2555 102 0 74
IV.SBPO.HNZ. 2023-09-18T17:28:42.21 3.0 undecidable manual P 0.87 0
IV.VMGN.HHZ. 2023-09-18T17:28:42.62 0.3 undecidable manual S 224 17.4714 105 0.28 70
IT.MOG.HNE. 2023-09-18T17:28:41.49 0.3 undecidable manual S 30 13.0758 110 0.62 64
GU.GSCL.HHE. 2023-09-18T17:28:40.37 3.0 undecidable manual P 0.34 0
IV.VISG.HHE. 2023-09-18T17:28:40.54 0.3 undecidable manual P 304 24.0537 101 -0.41 67
IV.RINC.EHZ. 2023-09-18T17:28:40.21 0.3 undecidable manual P 197 21.0678 103 -0.17 71
IV.SFI.EHZ. 2023-09-18T17:28:40.36 0.6 positive manual P 144 22.2555 102 -0.25 47
IV.VMGN.HHZ. 2023-09-18T17:28:39.71 0.6 positive manual P 224 17.4714 105 0.03 49
IT.MRR.HGE. 2023-09-18T17:28:38.90 0.3 undecidable manual S 266 6.4935 126 0.06 75
IT.MOG.HNE. 2023-09-18T17:28:38.77 0.3 undecidable manual P 30 13.0758 110 -0.06 74
IT.MRR.HGE. 2023-09-18T17:28:37.61 0.1 undecidable manual P 266 6.4935 126 -0.05 100
IV.LMD.HHZ. 2023-09-18T17:28:37.69 0.3 undecidable manual S 60 2.0979 156 -0.14 74
IV.LMD.HHZ. 2023-09-18T17:28:36.86 0.3 undecidable manual P 60 2.0979 156 -0.22 73
IV.FNVD.HHE. 2023-09-18T17:28:35.14 3.0 undecidable manual P -0.82 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:0.2 0.000013731009499999999 0.192 AML other m 2023-09-18T17:28:43.19
IV.VMGN.HHN. ML:0.2 0.000014329485 0.2176 AML other m 2023-09-18T17:28:43.04
IV.SFI.EHE. ML:0.3 0.00001608538 0.128 AML other m 2023-09-18T17:28:44.51
IV.SFI.EHN. ML:0.3 0.000014150345 1.0624 AML other m 2023-09-18T17:28:44.77
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