Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 01-10-2023 and time 03:18:56 (Italy) in region 3 km E Marradi (FI)

A magnitude ML 1.0 earthquake occured in region: 3 km E Marradi (FI), on

  • 01-10-2023 01:18:56 (UTC)
  • 01-10-2023 03:18:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0630, 11.6490 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
Marradi FI 3 3139 3139
Tredozio FC 8 1212 4351
Palazzuolo sul Senio FI 10 1154 5505
Portico e San Benedetto FC 11 756 6261
Premilcuore FC 14 799 7060
San Godenzo FI 15 1167 8227
Rocca San Casciano FC 16 1910 10137
Modigliana FC 16 4560 14697
Casola Valsenio RA 18 2617 17314

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
33 Km S of Imola (69797 inhabitants)
36 Km W of Forlì (117913 inhabitants)
45 Km NE of Firenze (382808 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km E of Prato (191150 inhabitants)
50 Km NE of Scandicci (50609 inhabitants)
54 Km SE of Bologna (386663 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
60 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
73 Km W of Rimini (147750 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
87 Km NE of Siena (53903 inhabitants)
87 Km SE of Modena (184973 inhabitants)
95 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 1.0 2023-10-01
01:18:56		 44.0633 11.6488 7 2023-10-01
01:27:12		 Sala Sismica INGV-Roma 121633471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-01 01:18:56 ± 0.11
Latitude 44.0633 ± 0.0045
Longitude 11.6488 ± 0.0075
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 121633471

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 526
Semi-minor axis of confidence ellipse (meter) 257
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 530.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.03238
Epicentral distance of station farthest from the epicenter (degree) 0.49463
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 121633471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-01 01:27:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-10-01T01:19:15.19 0.6 undecidable manual S 154 54.9006 50 0.3 44
IV.FNVD.HHZ. 2023-10-01T01:19:11.65 0.6 undecidable manual S 286 43.4232 50 -0.18 46
IV.MTRZ.HHZ. 2023-10-01T01:19:10.11 0.3 undecidable manual S 327 32.9448 102 1.55 40
IV.RUFI.EHZ. 2023-10-01T01:19:07.24 0.6 undecidable manual S 204 27.3504 105 0.55 44
IV.CRE.HHZ. 2023-10-01T01:19:06.86 1.0 undecidable manual P 154 54.9006 50 -0.42 21
IV.SFI.HNE. 2023-10-01T01:19:05.61 0.6 undecidable manual S 138 23.6541 107 0.16 48
IV.SEI.HHZ. 2023-10-01T01:19:05.15 0.6 undecidable manual S 268 23.1546 107 -0.14 48
IV.FNVD.HHZ. 2023-10-01T01:19:05.00 0.1 undecidable manual P 286 43.4232 50 -0.51 86
IV.VISG.HHZ. 2023-10-01T01:19:04.51 0.6 undecidable manual S 309 22.0668 108 -0.41 46
IV.RINC.EHZ. 2023-10-01T01:19:04.16 0.3 undecidable manual S 190 19.869 110 -0.06 74
IV.MTRZ.HHZ. 2023-10-01T01:19:03.98 0.1 undecidable manual P 327 32.9448 102 0.35 91
IV.VMGN.HHZ. 2023-10-01T01:19:03.10 0.6 undecidable manual S 218 15.2736 115 0.39 46
IT.MOG.HNE. 2023-10-01T01:19:02.84 0.6 undecidable manual S 38 15.1737 115 0.16 49
IV.RUFI.EHZ. 2023-10-01T01:19:02.36 0.1 undecidable manual P 204 27.3504 105 -0.19 95
IV.VISG.HHZ. 2023-10-01T01:19:01.29 0.6 positive manual P 309 22.0668 108 -0.23 47
IV.RINC.EHZ. 2023-10-01T01:19:01.25 0.1 undecidable manual P 190 19.869 110 0.13 97
IV.SFI.HNE. 2023-10-01T01:19:01.75 0.1 undecidable manual P 138 23.6541 107 -0.08 98
IV.SEI.HHZ. 2023-10-01T01:19:01.52 0.1 positive manual P 268 23.1546 107 -0.22 95
IV.VMGN.HHZ. 2023-10-01T01:19:00.52 0.1 undecidable manual P 218 15.2736 115 0.27 95
IT.MOG.HNE. 2023-10-01T01:19:00.27 0.1 undecidable manual P 38 15.1737 115 0.04 100
IV.LMD.HHZ. 2023-10-01T01:18:59.52 0.3 undecidable manual S 71 4.8951 145 -0.35 71
IT.MRR.HGZ. 2023-10-01T01:18:59.32 0.6 undecidable manual S 271 3.5964 153 -0.32 48
IT.MRR.HGZ. 2023-10-01T01:18:58.35 0.1 undecidable manual P 271 3.5964 153 -0.13 100
IV.LMD.HHZ. 2023-10-01T01:18:58.37 1.0 undecidable manual P 71 4.8951 145 -0.24 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHE. ML:1.0 0.0000664 1.78 AML other m 2023-10-01T01:19:04.98
IV.VMGN.HHN. ML:0.5 0.000031450000000000006 0.6 AML other m 2023-10-01T01:19:05.14
IV.VISG.HHN. ML:1.0 0.0000711 0.48 AML other m 2023-10-01T01:19:05.05
IV.SEI.HHE. ML:1.3 0.000142 0.56 AML other m 2023-10-01T01:19:05.67
IV.SEI.HHN. ML:1.6 0.000293 0.26 AML other m 2023-10-01T01:19:05.72
IV.VMGN.HHE. ML:0.5 0.000027749999999999997 0.26 AML other m 2023-10-01T01:19:05.94
IV.RINC.EHE. ML:0.8 0.000054550000000000005 0.46 AML other m 2023-10-01T01:19:07.64
IV.RINC.EHN. ML:0.7 0.00003989 0.64 AML other m 2023-10-01T01:19:08.02
IV.MTRZ.HHE. ML:1.2 0.00006325 0.34 AML other m 2023-10-01T01:19:11.69
IV.FNVD.HHE. ML:1.0 0.000028400000000000003 0.52 AML other m 2023-10-01T01:19:12.48
IV.FNVD.HHN. ML:0.5 0.00000837 0.56 AML other m 2023-10-01T01:19:12.49
IV.MTRZ.HHN. ML:1.1 0.000060700000000000005 0.42 AML other m 2023-10-01T01:19:13.45
IV.CRE.HHN. ML:1.2 0.0000412 0.2 AML other m 2023-10-01T01:19:15.57
IV.CRE.HHE. ML:0.9 0.00001775 0.28 AML other m 2023-10-01T01:19:15.70
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