Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 18-12-2023 and time 21:43:40 (UTC) in region 5 km W Tredozio (FC)

A magnitude ML 0.8 earthquake occured in region: 5 km W Tredozio (FC), on

  • 18-12-2023 21:43:40 (UTC)
  • 18-12-2023 22:43:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0720, 11.6830 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
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
Rocca San Casciano FC 13 1910 8171
Premilcuore FC 13 799 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

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)
54 Km SE of Bologna (386663 inhabitants)
56 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)
85 Km S of Ferrara (133155 inhabitants)
88 Km SE of Modena (184973 inhabitants)
88 Km NE of Siena (53903 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 0.8 2023-12-18
21:43:40		 44.0717 11.683 7 2023-12-18
22:10:56		 Sala Sismica INGV-Roma 124132641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-18 21:43:40 ± 0.1
Latitude 44.0717 ± 0.0045
Longitude 11.6830 ± 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 124132641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 364
Semi-minor axis of confidence ellipse (meter) 332
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 224
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
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) 0.01799
Epicentral distance of station farthest from the epicenter (degree) 0.49193
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 124132641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-18 22:10:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-12-18T21:43:58.43 0.1 undecidable manual S 157 54.6009 50 -0.02 92
IV.BOSL.HHZ. 2023-12-18T21:43:50.75 0.1 undecidable manual S 238 29.1486 103 -0.03 96
IV.CRE.HHZ. 2023-12-18T21:43:50.40 0.6 negative manual P 157 54.6009 50 -0.42 42
IV.RUFI.EHZ. 2023-12-18T21:43:50.82 0.1 undecidable manual S 208 29.3484 103 -0.04 96
IV.VISG.HHZ. 2023-12-18T21:43:49.13 0.1 undecidable manual S 303 23.6541 105 0.19 94
IV.SEI.HHZ. 2023-12-18T21:43:49.56 0.1 undecidable manual S 266 25.9518 104 -0.13 95
IV.SFI.EHZ. 2023-12-18T21:43:48.92 0.1 undecidable manual S 145 22.6551 106 0.32 91
IV.MTRZ.HHN. 2023-12-18T21:43:47.84 0.6 undecidable manual P 323 33.744 101 0.55 42
IV.VMGN.HHZ. 2023-12-18T21:43:47.17 0.1 undecidable manual S 223 17.6712 110 0.22 94
IV.RUFI.EHZ. 2023-12-18T21:43:46.15 0.1 undecidable manual P 208 29.3484 103 -0.29 91
IV.BOSL.HHZ. 2023-12-18T21:43:46.30 0.3 positive manual P 238 29.1486 103 -0.1 71
IV.SEI.HHZ. 2023-12-18T21:43:45.54 0.1 positive manual P 266 25.9518 104 -0.23 93
IV.SFI.EHZ. 2023-12-18T21:43:45.22 0.6 positive manual P 145 22.6551 106 0.08 48
IV.VISG.HHZ. 2023-12-18T21:43:45.36 0.6 negative manual P 303 23.6541 105 0.03 48
IV.VMGN.HHZ. 2023-12-18T21:43:44.38 0.1 positive manual P 223 17.6712 110 0.2 95
IV.LMD.HHZ. 2023-12-18T21:43:42.56 0.1 undecidable manual S 72 1.998 163 -0.23 96
IV.LMD.HHZ. 2023-12-18T21:43:41.73 0.1 undecidable manual P 72 1.998 163 -0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHN. ML:0.0 0.0043874940000000005 0.1152 AML other m 2023-12-18T21:43:42.62
IV.LMD.HHE. ML:0.0 0.0011599563499999999 0.128 AML other m 2023-12-18T21:43:42.62
IV.VMGN.HHE. ML:0.5 0.0000316 1.14 AML other m 2023-12-18T21:43:47.79
IV.VMGN.HHN. ML:0.6 0.000041099999999999996 0.6 AML other m 2023-12-18T21:43:47.87
IV.VISG.HHN. ML:0.6 0.00002401842 0.1024 AML other m 2023-12-18T21:43:50.35
IV.SFI.EHN. ML:1.1 0.00009145 0.1 AML other m 2023-12-18T21:43:49.62
IV.SFI.EHE. ML:1.0 0.00006390495 0.1792 AML other m 2023-12-18T21:43:49.94
IV.VISG.HHE. ML:0.6 0.000024050000000000002 1.32 AML other m 2023-12-18T21:43:50.10
IV.SEI.HHN. ML:1.5 0.00018068834999999999 0.4224 AML other m 2023-12-18T21:43:51.48
IV.SEI.HHE. ML:1.3 0.000115797045 0.1664 AML other m 2023-12-18T21:43:50.18
IV.BOSL.HHN. ML:0.5 0.000016102335 0.2432 AML other m 2023-12-18T21:43:50.81
IV.BOSL.HHE. ML:0.3 0.00001083 0.16 AML other m 2023-12-18T21:43:50.80
IV.CRE.HHE. ML:1.0 0.0000247973 0.1792 AML other m 2023-12-18T21:43:59.46
IV.CRE.HHN. ML:1.6 0.00008885 0.22 AML other m 2023-12-18T21:43:58.81
IV.RUFI.EHE. ML:0.3 0.0000096724515 0.2816 AML other m 2023-12-18T21:43:51.54
IV.RUFI.EHN. ML:0.7 0.0000242601315 0.2176 AML other m 2023-12-18T21:43:50.90
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