Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 18-09-2023 and time 17:41:37 (UTC) in region 5 km E Marradi (FI)

A magnitude ML 2.1 earthquake occured in region: 5 km E Marradi (FI), on

  • 18-09-2023 17:41:37 (UTC)
  • 18-09-2023 19:41:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0660, 11.6790 at 8 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 6 1212 4351
Portico e San Benedetto FC 9 756 5107
Palazzuolo sul Senio FI 12 1154 6261
Premilcuore FC 13 799 7060
Rocca San Casciano FC 13 1910 8970
Modigliana FC 14 4560 13530
San Godenzo FI 16 1167 14697
Dovadola FC 18 1653 16350
Casola Valsenio RA 18 2617 18967
Brisighella RA 19 7639 26606

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
34 Km SW of Forlì (117913 inhabitants)
46 Km W of Cesena (96758 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
88 Km NE of Siena (53903 inhabitants)
88 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 2.1 2023-09-18
17:41:37		 44.066 11.6787 8 2023-09-18
17:50:40		 Sala Sismica INGV-Roma 121200731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 17:41:37 ± 0.08
Latitude 44.0660 ± 0.0036
Longitude 11.6787 ± 0.0050
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121200731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 370
Semi-minor axis of confidence ellipse (meter) 161
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 120
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 45
Number of associated phases, regardless of their use for origin computation 43
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.69518
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 17
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 24
Type of magnitude ML
Reference to an origin 121200731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 17:50:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.OFFI.HHZ. 2023-09-18T17:42:36.43 3.0 undecidable manual Sg 2.68 0
IV.SGAL.EHN. 2023-09-18T17:42:32.94 3.0 undecidable manual Sn 0.75 0
IV.SBPO.HNZ. 2023-09-18T17:42:12.02 3.0 undecidable manual S -4.04 0
IV.SGAL.EHE. 2023-09-18T17:42:06.64 3.0 undecidable manual Pn -1.57 0
IV.MML1.EHZ. 2023-09-18T17:42:04.75 3.0 undecidable manual P 2.68 0
IV.CSNT.HHZ. 2023-09-18T17:42:00.63 3.0 undecidable manual S -0.14 0
IV.ATCC.EHZ. 2023-09-18T17:42:00.30 3.0 undecidable manual P 1.19 0
IV.OSSC.HHE. 2023-09-18T17:41:59.67 3.0 undecidable manual S -0.1 0
IV.CRE.HHZ. 2023-09-18T17:41:55.04 0.6 undecidable manual S 156 54.2013 50 0.14 45
IV.NDIM.HNZ. 2023-09-18T17:41:54.86 3.0 positive manual P -2.25 0
IV.CAFI.HHZ. 2023-09-18T17:41:53.04 3.0 positive manual P 0.29 0
IV.ATPI.EHZ. 2023-09-18T17:41:53.28 3.0 negative manual P -0.4 0
GU.POPM.HHZ. 2023-09-18T17:41:51.40 3.0 positive manual P 0.64 0
IV.PE3.EHZ. 2023-09-18T17:41:51.34 0.6 positive manual P 122 77.1672 50 0.34 41
IV.MOCL.EHZ. 2023-09-18T17:41:50.51 0.6 undecidable manual S 260 40.3263 50 -0.67 40
IV.CRMI.HHZ. 2023-09-18T17:41:49.10 3.0 positive manual Pg 0.1 0
IV.PARC.HHZ. 2023-09-18T17:41:49.08 3.0 negative manual Pg -0.42 0
IV.BOSL.HHZ. 2023-09-18T17:41:47.73 0.6 undecidable manual S 238 28.5492 106 0.16 47
IV.CRE.HHZ. 2023-09-18T17:41:47.02 0.3 undecidable manual P 156 54.2013 50 -0.43 63
IV.RUFI.EHZ. 2023-09-18T17:41:47.65 0.3 undecidable manual S 208 28.6491 106 0.03 72
IV.SEI.HHZ. 2023-09-18T17:41:46.66 0.1 undecidable manual S 267 25.5522 107 0.08 95
IV.SFI.EHN. 2023-09-18T17:41:45.67 0.3 undecidable manual S 143 22.3554 110 0.14 71
IV.VISG.HHN. 2023-09-18T17:41:45.94 0.3 undecidable manual S 305 23.754 109 -0.05 72
IV.RINC.EHZ. 2023-09-18T17:41:45.26 0.6 undecidable manual S 196 20.7681 111 0.26 46
IT.MCS.HGN. 2023-09-18T17:41:44.27 0.3 undecidable manual P 103 35.0427 103 -0.22 68
IV.MTRZ.HHE. 2023-09-18T17:41:44.65 0.1 undecidable manual P 324 34.0437 103 0.36 89
IV.MOCL.EHZ. 2023-09-18T17:41:44.93 0.3 positive manual P 260 40.3263 50 -0.38 65
IV.VMGN.HHE. 2023-09-18T17:41:44.12 0.3 undecidable manual S 223 16.9719 115 0.31 69
IV.IMOL.EHZ. 2023-09-18T17:41:44.46 0.3 undecidable manual P 9 32.9448 104 0.38 66
IV.RUFI.EHZ. 2023-09-18T17:41:43.15 0.1 positive manual P 208 28.6491 106 -0.11 94
IV.FAEN.HNE. 2023-09-18T17:41:43.92 0.6 undecidable manual P 32 29.3484 105 0.53 43
IV.BOSL.HHZ. 2023-09-18T17:41:43.25 0.1 positive manual P 238 28.5492 106 0.02 96
IT.MOG.HNE. 2023-09-18T17:41:43.15 0.3 undecidable manual S 31 13.5753 121 0.4 68
IV.SEI.HHZ. 2023-09-18T17:41:42.46 0.1 positive manual P 267 25.5522 107 -0.19 93
IV.SFI.EHN. 2023-09-18T17:41:42.02 0.1 positive manual P 143 22.3554 110 -0.03 97
IV.VISG.HHN. 2023-09-18T17:41:42.27 0.1 negative manual P 305 23.754 109 -0.04 96
IV.VMGN.HHE. 2023-09-18T17:41:41.35 0.1 negative manual P 223 16.9719 115 0.3 93
IV.RINC.EHZ. 2023-09-18T17:41:41.92 0.1 positive manual P 196 20.7681 111 0.18 94
IT.MRR.HGE. 2023-09-18T17:41:40.65 0.1 undecidable manual S 268 5.994 143 -0.12 98
IT.MOG.HNE. 2023-09-18T17:41:40.32 0.1 undecidable manual P 31 13.5753 121 -0.12 97
IT.MRR.HGE. 2023-09-18T17:41:39.28 0.1 undecidable manual P 268 5.994 143 -0.01 100
IV.LMD.HHZ. 2023-09-18T17:41:39.42 0.3 undecidable manual S 61 2.5974 162 -0.79 61
IV.LMD.HHZ. 2023-09-18T17:41:38.52 0.3 undecidable manual P 61 2.5974 162 -0.46 69
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHN. ML:1.9 0.0008255000000000001 0.24 AML other m 2023-09-18T17:41:44.84
IV.VMGN.HHE. ML:1.9 0.0007825 0.22 AML other m 2023-09-18T17:41:44.88
IV.RINC.EHE. ML:2.4 0.001695 0.22 AML other m 2023-09-18T17:41:45.58
IV.SFI.HNE. ML:2.2 0.0011 1.3 AML other m 2023-09-18T17:41:45.87
IV.SFI.EHE. ML:2.2 0.0010875 0.18 AML other m 2023-09-18T17:41:45.88
IV.SFI.HNN. ML:2.0 0.000665 0.12 AML other m 2023-09-18T17:41:46.43
IV.SFI.EHN. ML:2.0 0.000689 1.08 AML other m 2023-09-18T17:41:46.44
IV.VISG.HHE. ML:1.8 0.00038950000000000003 0.74 AML other m 2023-09-18T17:41:46.54
IV.VISG.HHN. ML:1.8 0.000376 1.72 AML other m 2023-09-18T17:41:46.90
IV.RINC.EHN. ML:2.2 0.001066 0.98 AML other m 2023-09-18T17:41:47.68
IV.SEI.HHN. ML:2.8 0.003585 0.2 AML other m 2023-09-18T17:41:47.35
IV.SEI.HHE. ML:2.6 0.0025 1.4 AML other m 2023-09-18T17:41:47.28
IV.RUFI.EHN. ML:2.2 0.000756 0.28 AML other m 2023-09-18T17:41:48.00
IV.BOSL.HHN. ML:1.5 0.0001705 0.24 AML other m 2023-09-18T17:41:48.34
IV.RUFI.EHE. ML:1.7 0.0002695 0.44 AML other m 2023-09-18T17:41:48.56
IV.BOSL.HHE. ML:1.4 0.00013925 0.78 AML other m 2023-09-18T17:41:49.04
IV.CPGN.EHN. ML:1.8 0.0001199 0.42 AML other m 2023-09-18T17:41:49.94
IV.MOCL.EHN. ML:2.1 0.0004385 0.28 AML other m 2023-09-18T17:41:51.70
IV.MOCL.EHE. ML:2.2 0.000503 0.64 AML other m 2023-09-18T17:41:51.72
IV.IMOL.EHN. ML:1.8 0.0003015 1.78 AML other m 2023-09-18T17:41:51.01
IV.IMOL.EHE. ML:2.0 0.0004892000000000001 1.66 AML other m 2023-09-18T17:41:51.13
IV.CPGN.HNN. ML:2.3 0.0004485 0.48 AML other m 2023-09-18T17:41:52.43
IV.IMOL.HNE. ML:2.4 0.00108 0.34 AML other m 2023-09-18T17:41:52.48
IV.CPGN.HNE. ML:2.2 0.0003355 0.4 AML other m 2023-09-18T17:41:52.62
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
Waveforms Seismic signals in miniseed + resp format Download