Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 1.3 on date 03-12-2023 and time 01:17:28 (UTC) in region 4 km NE Marradi (FI)

A magnitude Md 1.3 earthquake occured in region: 4 km NE Marradi (FI), on

  • 03-12-2023 01:17:28 (UTC)
  • 03-12-2023 02:17:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1100, 11.6380 at 9 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 4 3139 3139
Palazzuolo sul Senio FI 7 1154 4293
Tredozio FC 9 1212 5505
Casola Valsenio RA 13 2617 8122
Modigliana FC 14 4560 12682
Portico e San Benedetto FC 15 756 13438
Castel del Rio BO 16 1246 14684
Brisighella RA 16 7639 22323
Rocca San Casciano FC 17 1910 24233
Fontanelice BO 18 1943 26176
Premilcuore FC 19 799 26975
Borgo Tossignano BO 19 3288 30263
Riolo Terme RA 20 5720 35983

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Faenza (58541 inhabitants)
28 Km S of Imola (69797 inhabitants)
35 Km W of Forlì (117913 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
49 Km SE of Bologna (386663 inhabitants)
50 Km NE of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
74 Km N of Arezzo (99543 inhabitants)
74 Km W of Rimini (147750 inhabitants)
81 Km S of Ferrara (133155 inhabitants)
82 Km SE of Modena (184973 inhabitants)
91 Km N of Siena (53903 inhabitants)
96 Km E of Lucca (89046 inhabitants)
96 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 1.3 2023-12-03
01:17:28		 44.1103 11.6377 9 2023-12-03
01:23:14		 Sala Sismica INGV-Roma 123727501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-12-03 01:17:28 ± 0.29
Latitude 44.1103 ± 0.0081
Longitude 11.6377 ± 0.0138
Depth (km) 9 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 123727501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1199
Semi-minor axis of confidence ellipse (meter) 105
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 121
Circular confidence region, given by single value of horizontal uncertainty (meter) 1200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 83
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.05216
Epicentral distance of station farthest from the epicenter (degree) 0.36153
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

Md:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude Md
Reference to an origin 123727501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-12-03 01:23:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BRSN.EHZ. 2023-12-03T01:17:44.62 0.3 undecidable manual S 61 40.1265 50 2.16 40
IV.IMOL.EHZ. 2023-12-03T01:17:40.50 0.3 undecidable manual S 17 28.8489 108 1.12 50
IV.BOSL.HHZ. 2023-12-03T01:17:40.01 0.6 undecidable manual S 227 28.9488 108 0.6 44
IV.RUFI.EHZ. 2023-12-03T01:17:40.53 0.6 undecidable manual S 199 31.9458 50 0.26 48
IV.SFI.EHZ. 2023-12-03T01:17:39.03 0.6 undecidable manual S 144 28.2495 108 -0.16 49
IV.RINC.EHZ. 2023-12-03T01:17:38.47 0.6 undecidable manual S 186 24.9528 110 0.37 45
IV.BRSN.EHZ. 2023-12-03T01:17:37.05 0.6 negative manual P 61 40.1265 50 0.33 47
IV.VMGN.HHZ. 2023-12-03T01:17:36.92 0.6 undecidable manual S 206 19.1697 116 0.66 41
IV.VISG.HHZ. 2023-12-03T01:17:35.70 0.6 undecidable manual S 298 18.3705 117 -0.3 48
IV.RUFI.EHZ. 2023-12-03T01:17:35.04 0.1 undecidable manual P 199 31.9458 50 -0.41 85
IV.SFI.EHZ. 2023-12-03T01:17:34.32 1.0 positive manual P 144 28.2495 108 -0.51 22
IV.IMOL.EHZ. 2023-12-03T01:17:34.74 0.3 positive manual P 17 28.8489 108 -0.2 70
IV.BOSL.HHZ. 2023-12-03T01:17:34.77 0.1 undecidable manual P 227 28.9488 108 -0.18 93
IV.RINC.EHZ. 2023-12-03T01:17:34.00 0.1 undecidable manual P 186 24.9528 110 -0.2 94
IT.MOG.HNE. 2023-12-03T01:17:33.40 0.6 undecidable manual S 57 12.2766 127 -0.78 47
IV.VMGN.HHZ. 2023-12-03T01:17:33.22 0.3 positive manual P 206 19.1697 116 0.08 75
IT.MRR.HGZ. 2023-12-03T01:17:32.78 0.6 undecidable manual S 208 5.7942 148 0.14 44
IV.VISG.HHZ. 2023-12-03T01:17:32.56 0.6 positive manual P 298 18.3705 117 -0.43 45
IT.MOG.HNE. 2023-12-03T01:17:31.31 0.1 undecidable manual P 57 12.2766 127 -0.63 91
IT.MRR.HGZ. 2023-12-03T01:17:30.98 0.1 undecidable manual P 208 5.7942 148 -0.07 100
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