Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 28-09-2023 and time 03:11:34 (Italy) in region 5 km E Marradi (FI)

A magnitude ML 1.8 earthquake occured in region: 5 km E Marradi (FI), on

  • 28-09-2023 01:11:34 (UTC)
  • 28-09-2023 03:11:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0520, 11.6730 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 5 3139 3139
Tredozio FC 7 1212 4351
Portico e San Benedetto FC 9 756 5107
Premilcuore FC 12 799 5906
Palazzuolo sul Senio FI 12 1154 7060
Rocca San Casciano FC 14 1910 8970
San Godenzo FI 15 1167 10137
Modigliana FC 15 4560 14697
Dovadola FC 19 1653 16350
Casola Valsenio RA 20 2617 18967

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
34 Km S of Imola (69797 inhabitants)
35 Km SW of Forlì (117913 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
47 Km W of Cesena (96758 inhabitants)
50 Km E of Prato (191150 inhabitants)
51 Km NE of Scandicci (50609 inhabitants)
56 Km SE of Bologna (386663 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
67 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
86 Km NE of Siena (53903 inhabitants)
87 Km S of Ferrara (133155 inhabitants)
89 Km SE of Modena (184973 inhabitants)
97 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 1.8 2023-09-28
01:11:34		 44.0523 11.6727 7 2023-09-28
01:20:06		 Sala Sismica INGV-Roma 121529191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-28 01:11:34 ± 0.1
Latitude 44.0523 ± 0.0027
Longitude 11.6727 ± 0.0050
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 121529191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 377
Semi-minor axis of confidence ellipse (meter) 190
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 292
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.41099
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 46
Type of magnitude ML
Reference to an origin 121529191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-28 01:20:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
OX.MPRI.HHZ. 2023-09-28T01:12:47.34 3.0 undecidable manual Sg 4.18 0
IV.STAL.HHZ. 2023-09-28T01:12:42.30 3.0 undecidable manual Sn 0.4 0
IV.ATPI.EHZ. 2023-09-28T01:12:02.30 3.0 undecidable manual S -0.4 0
IV.PARC.HHZ. 2023-09-28T01:11:54.58 3.0 undecidable manual S -0.68 0
IV.PII.HHZ. 2023-09-28T01:11:51.72 3.0 negative manual P -0.01 0
IV.ATVO.HHZ. 2023-09-28T01:11:51.49 3.0 undecidable manual P 0.35 0
IV.NARO.HHZ. 2023-09-28T01:11:50.60 3.0 undecidable manual P 0.65 0
IV.PIEI.HHZ. 2023-09-28T01:11:50.55 3.0 positive manual P 0.25 0
IV.FNVD.HHZ. 2023-09-28T01:11:50.15 0.6 undecidable manual S 287 45.621 50 0.33 44
IV.CAFI.HHZ. 2023-09-28T01:11:49.32 3.0 negative manual P 0.09 0
IV.BDI.HHZ. 2023-09-28T01:11:49.88 3.0 negative manual P 0.33 0
IV.IMOL.EHZ. 2023-09-28T01:11:47.02 0.6 undecidable manual S 9 34.5432 101 0.6 42
IV.CSNT.HHZ. 2023-09-28T01:11:47.29 3.0 undecidable manual P 0.17 0
IV.MTRZ.HHZ. 2023-09-28T01:11:46.49 0.6 undecidable manual S 326 34.9428 101 -0.09 47
IV.PARC.HHZ. 2023-09-28T01:11:45.65 3.0 positive manual P -0.29 0
IV.CRMI.HHZ. 2023-09-28T01:11:45.28 3.0 undecidable manual P -0.33 0
IV.CRE.HHZ. 2023-09-28T01:11:43.65 3.0 positive manual P -0.48 0
IV.VISG.HHZ. 2023-09-28T01:11:43.02 0.3 undecidable manual S 309 24.2535 105 0.06 73
IV.RUFI.EHZ. 2023-09-28T01:11:43.77 0.6 undecidable manual S 209 27.1506 104 -0.13 47
IV.SEI.HHZ. 2023-09-28T01:11:43.10 0.3 undecidable manual S 271 25.0527 105 -0.11 72
IV.BOSL.HHZ. 2023-09-28T01:11:43.98 0.3 undecidable manual S 241 27.3504 104 0 73
IV.MTRZ.HHZ. 2023-09-28T01:11:42.23 0.6 undecidable manual P 326 34.9428 101 0.88 37
IV.FNVD.HHZ. 2023-09-28T01:11:42.83 0.3 positive manual P 287 45.621 50 -0.4 65
IV.SFI.HNZ. 2023-09-28T01:11:42.00 0.3 undecidable manual S 140 21.4674 107 -0.02 73
IV.IMOL.EHZ. 2023-09-28T01:11:41.48 0.6 positive manual P 9 34.5432 101 0.22 46
IV.RINC.EHZ. 2023-09-28T01:11:41.62 0.3 undecidable manual S 196 19.1697 109 0.37 69
IV.VMGN.HHZ. 2023-09-28T01:11:40.64 0.3 undecidable manual S 226 15.5733 113 0.55 66
IT.MOG.HNZ. 2023-09-28T01:11:40.27 0.6 undecidable manual S 30 15.0738 114 0.32 47
IV.BOSL.HHZ. 2023-09-28T01:11:39.71 0.1 positive manual P 241 27.3504 104 -0.15 95
IV.RUFI.EHZ. 2023-09-28T01:11:39.57 0.1 undecidable manual P 209 27.1506 104 -0.24 93
IV.SEI.HHZ. 2023-09-28T01:11:39.06 0.1 positive manual P 271 25.0527 105 -0.35 91
IV.RINC.EHZ. 2023-09-28T01:11:38.35 0.1 positive manual P 196 19.1697 109 0.08 97
IV.SFI.HNZ. 2023-09-28T01:11:38.60 0.3 positive manual P 140 21.4674 107 -0.12 72
IV.VISG.HHZ. 2023-09-28T01:11:38.90 0.1 positive manual P 309 24.2535 105 -0.36 91
IT.MOG.HNZ. 2023-09-28T01:11:37.48 0.1 undecidable manual P 30 15.0738 114 -0.04 99
IV.VMGN.HHZ. 2023-09-28T01:11:37.82 0.1 positive manual P 226 15.5733 113 0.21 95
IT.MRR.HGZ. 2023-09-28T01:11:37.24 0.6 undecidable manual S 283 5.6943 140 -0.02 50
IV.LMD.HHZ. 2023-09-28T01:11:36.70 0.1 undecidable manual S 45 3.8961 150 -0.21 97
IT.MRR.HGZ. 2023-09-28T01:11:36.03 0.1 undecidable manual P 283 5.6943 140 0.05 100
IV.LMD.HHZ. 2023-09-28T01:11:35.62 0.1 undecidable manual P 45 3.8961 150 -0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHN. ML:2.1 0.001335 0.86 AML other m 2023-09-28T01:11:41.87
IV.VMGN.HHE. ML:1.8 0.000727 0.6 AML other m 2023-09-28T01:11:41.83
IV.SFI.EHE. ML:2.1 0.0009350000000000001 0.24 AML other m 2023-09-28T01:11:42.27
IV.SFI.HNE. ML:2.1 0.0009745 0.24 AML other m 2023-09-28T01:11:42.27
IV.SFI.HNN. ML:2.0 0.0006670000000000001 0.72 AML other m 2023-09-28T01:11:42.19
IV.SFI.EHN. ML:1.9 0.0006454999999999999 0.72 AML other m 2023-09-28T01:11:42.19
IV.RINC.EHE. ML:2.2 0.0012435 1.34 AML other m 2023-09-28T01:11:43.08
IV.VISG.HHE. ML:1.6 0.000253 0.36 AML other m 2023-09-28T01:11:43.27
IV.RINC.EHN. ML:2.0 0.0008665000000000001 1.16 AML other m 2023-09-28T01:11:43.16
IV.SEI.HHE. ML:2.2 0.00102 0.24 AML other m 2023-09-28T01:11:43.63
IV.VISG.HHN. ML:1.8 0.0003835 0.72 AML other m 2023-09-28T01:11:44.83
IV.BOSL.HHN. ML:1.6 0.0002265 0.44 AML other m 2023-09-28T01:11:44.62
IV.SEI.HHN. ML:2.6 0.0023250000000000002 0.28 AML other m 2023-09-28T01:11:45.53
IV.BOSL.HHE. ML:1.4 0.00014500000000000003 0.36 AML other m 2023-09-28T01:11:47.45
IV.IMOL.HNN. ML:2.3 0.0009235 0.18 AML other m 2023-09-28T01:11:49.16
IV.IMOL.HNE. ML:2.4 0.0009710000000000001 0.24 AML other m 2023-09-28T01:11:50.25
IV.FNVD.HHN. ML:1.5 0.00009965 1.78 AML other m 2023-09-28T01:11:51.00
IV.CRE.HHN. ML:2.2 0.00043 0.22 AML other m 2023-09-28T01:11:51.93
IV.MPPT.EHE. ML:1.5 0.00008269999999999999 0.78 AML other m 2023-09-28T01:11:52.41
IV.MTRZ.HNE. ML:2.1 0.0005344999999999999 0.54 AML other m 2023-09-28T01:11:52.41
IV.MTRZ.HHE. ML:2.1 0.0005145 0.5 AML other m 2023-09-28T01:11:52.67
IV.MTRZ.HHN. ML:2.1 0.0005475 1.36 AML other m 2023-09-28T01:11:52.84
IV.MTRZ.HNN. ML:2.1 0.0005145 1.36 AML other m 2023-09-28T01:11:52.84
IV.CRE.HHE. ML:1.9 0.00018449999999999999 1.1 AML other m 2023-09-28T01:11:52.39
IV.FNVD.HHE. ML:1.9 0.0002215 0.58 AML other m 2023-09-28T01:11:53.06
IV.MPPT.EHN. ML:1.6 0.00010235 0.54 AML other m 2023-09-28T01:11:55.28
IV.CRMI.HHN. ML:1.7 0.00009035 0.34 AML other m 2023-09-28T01:11:56.46
IV.PARC.HHN. ML:1.6 0.00006900000000000001 1.16 AML other m 2023-09-28T01:11:59.85
IV.CRMI.HHE. ML:1.4 0.0000451 1.62 AML other m 2023-09-28T01:12:00.14
IV.CSNT.HHE. ML:1.8 0.0001075 0.48 AML other m 2023-09-28T01:12:00.97
IV.PARC.HHE. ML:1.5 0.00005665 0.38 AML other m 2023-09-28T01:12:01.73
IV.CSNT.HHN. ML:2.0 0.00016700000000000002 1.12 AML other m 2023-09-28T01:12:02.84
IV.BDI.HHN. ML:1.6 0.000045249999999999995 0.84 AML other m 2023-09-28T01:12:02.46
IV.BDI.HHE. ML:1.6 0.0000563 1.3 AML other m 2023-09-28T01:12:03.01
IV.ATPI.EHN. ML:1.6 0.0000499 1.3 AML other m 2023-09-28T01:12:05.74
IV.CAFI.HHN. ML:1.6 0.0000486 1.38 AML other m 2023-09-28T01:12:05.29
IV.CAFI.HHE. ML:1.7 0.00006920000000000002 0.6 AML other m 2023-09-28T01:12:06.50
IV.ATVO.HHN. ML:1.8 0.0000604 0.98 AML other m 2023-09-28T01:12:06.89
IV.PII.HHE. ML:1.7 0.00005085 0.74 AML other m 2023-09-28T01:12:07.27
IV.PIEI.HHN. ML:1.3 0.000025600000000000002 0.64 AML other m 2023-09-28T01:12:08.74
IV.PII.HHN. ML:1.7 0.00005629999999999999 1.68 AML other m 2023-09-28T01:12:09.92
IV.ATVO.HHE. ML:1.7 0.00005685 0.32 AML other m 2023-09-28T01:12:09.94
IV.PIEI.HHE. ML:1.6 0.00004545000000000001 1.68 AML other m 2023-09-28T01:12:10.99
IV.NARO.HHN. ML:1.6 0.000045350000000000005 0.36 AML other m 2023-09-28T01:12:10.75
IV.NARO.HHE. ML:1.5 0.000037749999999999996 0.58 AML other m 2023-09-28T01:12:11.34
IV.ATPI.EHE. ML:1.5 0.000039349999999999994 1.58 AML other m 2023-09-28T01:12:13.01
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