Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 18-12-2023 and time 06:17:17 (UTC) in region 3 km E Marradi (FI)

A magnitude ML 0.6 earthquake occured in region: 3 km E Marradi (FI), on

  • 18-12-2023 06:17:17 (UTC)
  • 18-12-2023 07:17:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0710, 11.6450 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.

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
Marradi FI 3 3139 3139
Tredozio FC 8 1212 4351
Palazzuolo sul Senio FI 9 1154 5505
Portico e San Benedetto FC 12 756 6261
Premilcuore FC 15 799 7060
Modigliana FC 15 4560 11620
Rocca San Casciano FC 16 1910 13530
San Godenzo FI 16 1167 14697
Casola Valsenio RA 17 2617 17314
Castel del Rio BO 19 1246 18560
Brisighella RA 20 7639 26199

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
36 Km W of Forlì (117913 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km E of Prato (191150 inhabitants)
51 Km NE of Scandicci (50609 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
60 Km E of Pistoia (90315 inhabitants)
70 Km N of Arezzo (99543 inhabitants)
74 Km W of Rimini (147750 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
86 Km SE of Modena (184973 inhabitants)
87 Km NE of Siena (53903 inhabitants)
95 Km E of Lucca (89046 inhabitants)
100 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 0.6 2023-12-18
06:17:17		 44.0708 11.6448 10 2023-12-18
06:23:50		 Sala Sismica INGV-Roma 124119911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-18 06:17:17 ± 0.14
Latitude 44.0708 ± 0.0054
Longitude 11.6448 ± 0.0075
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 124119911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 614
Semi-minor axis of confidence ellipse (meter) 379
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 37
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.04497
Epicentral distance of station farthest from the epicenter (degree) 0.25271
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 124119911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-18 06:23:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHE. 2023-12-18T06:17:27.96 0.6 undecidable manual S 203 28.0497 50 -0.18 46
IV.SFI.EHZ. 2023-12-18T06:17:27.30 0.6 undecidable manual S 139 24.4533 112 0.14 47
IV.VISG.HHZ. 2023-12-18T06:17:26.20 0.6 undecidable manual S 308 21.2676 115 0.06 48
IV.SEI.HHZ. 2023-12-18T06:17:26.29 0.6 undecidable manual S 265 22.8549 114 -0.36 45
IV.VMGN.HHZ. 2023-12-18T06:17:24.45 0.6 undecidable manual S 215 15.6732 123 0.01 49
IV.SEI.HHZ. 2023-12-18T06:17:23.53 0.6 undecidable manual P 265 22.8549 114 0.55 43
IV.RUFI.EHE. 2023-12-18T06:17:23.73 1.0 undecidable manual P 203 28.0497 50 -0.12 24
IV.SFI.EHZ. 2023-12-18T06:17:23.37 3.0 negative manual P 139 24.4533 112 0.09 0
IV.VISG.HHZ. 2023-12-18T06:17:22.67 0.1 undecidable manual P 308 21.2676 115 -0.02 97
IV.LMD.HHZ. 2023-12-18T06:17:21.57 0.6 undecidable manual S 82 4.995 153 -0.29 47
IV.VMGN.HHZ. 2023-12-18T06:17:21.80 0.3 positive manual P 215 15.6732 123 0.09 73
IV.LMD.HHZ. 2023-12-18T06:17:20.24 0.1 undecidable manual P 82 4.995 153 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:0.5 0.000031075635 0.1216 AML other m 2023-12-18T06:17:24.75
IV.VMGN.HHN. ML:0.6 0.00003336901 0.0992 AML other m 2023-12-18T06:17:24.77
IV.VISG.HHE. ML:0.5 0.000018411035 0.08 AML other m 2023-12-18T06:17:26.55
IV.VISG.HHN. ML:0.6 0.00002771266 0.1376 AML other m 2023-12-18T06:17:27.35
IV.SEI.HHE. ML:0.7 0.000035621725 0.2208 AML other m 2023-12-18T06:17:26.42
IV.SEI.HHN. ML:0.9 0.000053262465 0.3616 AML other m 2023-12-18T06:17:29.36
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