Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 28-10-2023 and time 05:43:40 (UTC) in region 1 km SE Marradi (FI)

A magnitude ML 0.6 earthquake occured in region: 1 km SE Marradi (FI), on

  • 28-10-2023 05:43:40 (UTC)
  • 28-10-2023 07:43:40 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0670, 11.6260 at 6 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 1 3139 3139
Palazzuolo sul Senio FI 8 1154 4293
Tredozio FC 10 1212 5505
Portico e San Benedetto FC 13 756 6261
San Godenzo FI 16 1167 7428
Premilcuore FC 16 799 8227
Modigliana FC 17 4560 12787
Rocca San Casciano FC 17 1910 14697
Casola Valsenio RA 18 2617 17314
Castel del Rio BO 19 1246 18560
Vicchio FI 20 8044 26604

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Faenza (58541 inhabitants)
33 Km S of Imola (69797 inhabitants)
37 Km W of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
47 Km E of Prato (191150 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
50 Km W of Cesena (96758 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
59 Km E of Pistoia (90315 inhabitants)
60 Km SW of Ravenna (159116 inhabitants)
70 Km NW of Arezzo (99543 inhabitants)
75 Km W of Rimini (147750 inhabitants)
85 Km SE of Modena (184973 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
86 Km N of Siena (53903 inhabitants)
93 Km E of Lucca (89046 inhabitants)
99 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 2023-10-28
05:43:40		 44.067 11.6263 6 2023-10-28
06:04:35		 Sala Sismica INGV-Roma 122497321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-28 05:43:40 ± 0.11
Latitude 44.0670 ± 0.0027
Longitude 11.6263 ± 0.0050
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122497321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 329
Semi-minor axis of confidence ellipse (meter) 244
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 255
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 128
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) 0.24372
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 122497321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-28 06:04:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2023-10-28T05:44:03.17 3.0 undecidable manual P 0.88 0
GU.GSCL.HHZ. 2023-10-28T05:43:57.62 3.0 positive manual P 0.06 0
IV.RUFI.EHZ. 2023-10-28T05:43:49.75 0.6 undecidable manual S 200 27.0507 103 -0.19 46
IV.SEI.HHZ. 2023-10-28T05:43:48.05 0.6 undecidable manual S 266 21.3675 106 0.02 48
IV.RINC.EHZ. 2023-10-28T05:43:47.75 0.6 undecidable manual S 184 20.0688 107 0.15 47
IV.VISG.HHZ. 2023-10-28T05:43:47.89 0.6 undecidable manual S 312 20.4684 106 0.18 47
IV.VMGN.HHZ. 2023-10-28T05:43:46.03 0.6 undecidable manual S 211 14.5743 113 0.24 47
IV.RUFI.EHZ. 2023-10-28T05:43:45.57 0.6 undecidable manual P 200 27.0507 103 -0.31 45
IV.RINC.EHZ. 2023-10-28T05:43:44.56 0.1 undecidable manual P 184 20.0688 107 0.04 97
IV.SEI.HHZ. 2023-10-28T05:43:44.59 0.1 undecidable manual P 266 21.3675 106 -0.18 94
IV.VISG.HHZ. 2023-10-28T05:43:44.63 0.1 undecidable manual P 312 20.4684 106 0.05 97
IV.VMGN.HHZ. 2023-10-28T05:43:43.61 0.1 undecidable manual P 211 14.5743 113 0.13 96
IV.LMD.HHZ. 2023-10-28T05:43:43.44 0.6 undecidable manual S 80 6.5934 133 0.03 50
IT.MRR.HGZ. 2023-10-28T05:43:42.39 0.6 undecidable manual S 260 1.8981 163 -0.12 49
IV.LMD.HHZ. 2023-10-28T05:43:42.08 1.0 undecidable manual P 80 6.5934 133 -0.03 25
IT.MRR.HGZ. 2023-10-28T05:43:41.56 0.1 undecidable manual P 260 1.8981 163 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.0 0.00013463260499999998 0.1216 AML other m 2023-10-28T05:43:43.57
IV.LMD.HHN. ML:0.0 0.00028577284999999997 0.1024 AML other m 2023-10-28T05:43:43.58
IV.VMGN.HHE. ML:0.2 0.000018639901 0.1024 AML other m 2023-10-28T05:43:46.53
IV.VMGN.HHN. ML:0.4 0.000023614449499999997 0.1024 AML other m 2023-10-28T05:43:46.56
IV.SEI.HHE. ML:0.8 0.000051926249999999994 0.48 AML other m 2023-10-28T05:43:50.89
IV.SEI.HHN. ML:1.2 0.00011097983499999999 0.2592 AML other m 2023-10-28T05:43:48.47
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