Earthquake with magnitude of ML 0.7 on date 20-09-2023 and time 18:02:02 (UTC) in region 3 km E Marradi (FI)

A magnitude ML 0.7 earthquake occured in region: 3 km E Marradi (FI), on

  • 20-09-2023 18:02:02 (UTC)
  • 20-09-2023 20:02:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0820, 11.6520 at 5 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.

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 7 1212 4351
Palazzuolo sul Senio FI 9 1154 5505
Portico e San Benedetto FC 12 756 6261
Modigliana FC 14 4560 10821
Premilcuore FC 15 799 11620
Rocca San Casciano FC 16 1910 13530
Casola Valsenio RA 16 2617 16147
San Godenzo FI 17 1167 17314
Brisighella RA 18 7639 24953
Castel del Rio BO 19 1246 26199
Dovadola FC 19 1653 27852

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
31 Km S of Imola (69797 inhabitants)
35 Km W of Forlì (117913 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
48 Km W of Cesena (96758 inhabitants)
50 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
71 Km N of Arezzo (99543 inhabitants)
73 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
85 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 inhabitants)
96 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 0.7 2023-09-20
18:02:02
44.082 11.6515 5 2023-09-20
18:11:10
Sala Sismica INGV-Roma 121285601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-20 18:02:02 ± 0.09
Latitude 44.0820 ± 0.0027
Longitude 11.6515 ± 0.0038
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121285601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 320
Semi-minor axis of confidence ellipse (meter) 87
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 329
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.28239
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 121285601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-20 18:11:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CAFI.HHZ. 2023-09-20T18:02:29.54 3.0 undecidable manual S -0.22 0
IV.MCIV.CHZ. 2023-09-20T18:02:25.54 3.0 undecidable manual P -0.15 0
IV.ATFO.HHZ. 2023-09-20T18:02:22.75 3.0 negative manual P 2 0
IV.BOSL.HHZ. 2023-09-20T18:02:12.37 0.6 undecidable manual S 233 27.75 101 0.31 46
IV.RUFI.EHZ. 2023-09-20T18:02:12.51 0.6 undecidable manual S 203 29.3484 100 -0.1 47
IV.SFI.EHZ. 2023-09-20T18:02:11.28 0.3 undecidable manual S 142 25.0527 102 0.12 71
IV.RINC.EHZ. 2023-09-20T18:02:10.29 0.3 undecidable manual S 189 21.9669 104 0.18 71
IV.SEI.HHZ. 2023-09-20T18:02:10.86 0.6 undecidable manual S 263 23.5542 103 0.22 47
IV.MTRZ.HNZ. 2023-09-20T18:02:09.17 1.0 undecidable manual P 325 31.3464 100 0.55 21
IV.VISG.HHZ. 2023-09-20T18:02:09.99 0.6 undecidable manual S 305 20.9679 104 0.22 47
IV.VMGN.HHZ. 2023-09-20T18:02:08.72 0.6 undecidable manual S 214 17.0718 107 0.27 47
IV.SFI.EHZ. 2023-09-20T18:02:07.22 0.6 undecidable manual P 142 25.0527 102 -0.18 47
IT.MOG.HNZ. 2023-09-20T18:02:07.44 0.6 undecidable manual S 43 13.4754 112 0.17 48
IV.BOSL.HHZ. 2023-09-20T18:02:07.80 0.6 undecidable manual P 233 27.75 101 -0.12 47
IV.RUFI.EHZ. 2023-09-20T18:02:07.85 0.3 undecidable manual P 203 29.3484 100 -0.38 67
IV.SEI.HHZ. 2023-09-20T18:02:06.84 0.1 positive manual P 263 23.5542 103 -0.26 93
IV.VISG.HHZ. 2023-09-20T18:02:06.40 0.1 undecidable manual P 305 20.9679 104 -0.2 94
IV.RINC.EHZ. 2023-09-20T18:02:06.77 0.6 positive manual P 189 21.9669 104 -0.02 49
IV.VMGN.HHZ. 2023-09-20T18:02:05.98 0.1 positive manual P 214 17.0718 107 0.15 96
IT.MOG.HNZ. 2023-09-20T18:02:05.27 0.1 undecidable manual P 43 13.4754 112 0.12 97
IT.MRR.HGZ. 2023-09-20T18:02:04.53 0.3 undecidable manual S 243 4.2957 141 -0.1 74
IV.LMD.HHZ. 2023-09-20T18:02:04.65 0.3 undecidable manual S 96 4.4955 140 -0.02 76
IV.LMD.HHZ. 2023-09-20T18:02:03.54 0.3 positive manual P 96 4.4955 140 -0.11 74
IT.MRR.HGZ. 2023-09-20T18:02:03.58 0.1 undecidable manual P 243 4.2957 141 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:0.7 0.00004704999999999999 0.48 AML other m 2023-09-20T18:02:09.43
IV.VISG.HHN. ML:0.7 0.0000424 0.1 AML other m 2023-09-20T18:02:10.37
IV.SFI.EHE. ML:1.0 0.00006964999999999999 0.74 AML other m 2023-09-20T18:02:11.75
IV.VMGN.HHN. ML:0.8 0.000053599999999999995 0.62 AML other m 2023-09-20T18:02:11.40
IV.SFI.EHN. ML:1.3 0.000124 1.9 AML other m 2023-09-20T18:02:11.95
IV.BOSL.HHN. ML:0.6 0.00001825 0.36 AML other m 2023-09-20T18:02:12.80
IV.BOSL.HHE. ML:0.4 0.00001465 1.24 AML other m 2023-09-20T18:02:12.18
IV.VISG.HHE. ML:0.6 0.00003075 0.42 AML other m 2023-09-20T18:02:14.22
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download