Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 18-09-2023 and time 07:45:38 (UTC) in region 4 km E Marradi (FI)

A magnitude ML 2.2 earthquake occured in region: 4 km E Marradi (FI), on

  • 18-09-2023 07:45:38 (UTC)
  • 18-09-2023 09:45:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0790, 11.6650 at 10 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 4 3139 3139
Tredozio FC 6 1212 4351
Palazzuolo sul Senio FI 10 1154 5505
Portico e San Benedetto FC 11 756 6261
Modigliana FC 14 4560 10821
Rocca San Casciano FC 14 1910 12731
Premilcuore FC 14 799 13530
Casola Valsenio RA 17 2617 16147
San Godenzo FI 17 1167 17314
Brisighella RA 18 7639 24953
Dovadola FC 19 1653 26606
Castel del Rio BO 20 1246 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)
34 Km W of Forlì (117913 inhabitants)
47 Km W of Cesena (96758 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
50 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
70 Km N of Arezzo (99543 inhabitants)
72 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
86 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 inhabitants)
97 Km E of Lucca (89046 inhabitants)
100 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 2.2 2023-09-18
07:45:38		 44.0793 11.6647 10 2023-09-18
07:56:41		 Sala Sismica INGV-Roma 121171291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 07:45:38 ± 0.12
Latitude 44.0793 ± 0.0054
Longitude 11.6647 ± 0.0075
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121171291

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 720
Semi-minor axis of confidence ellipse (meter) 95
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 228
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 18
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) 0.43078
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 11
Magnitude information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 36
Type of magnitude ML
Reference to an origin 121171291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 07:56:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2023-09-18T07:46:12.81 3.0 undecidable manual Pg 4.16 0
IV.ATVO.HHZ. 2023-09-18T07:46:09.30 3.0 undecidable manual S -1.26 0
IV.ATMI.HHZ. 2023-09-18T07:46:08.88 3.0 undecidable manual S -0.97 0
IV.CING.HHZ. 2023-09-18T07:46:04.27 3.0 undecidable manual P 0.88 0
GU.POPM.HHZ. 2023-09-18T07:46:01.22 3.0 undecidable manual S 0.02 0
IV.CSNT.HHZ. 2023-09-18T07:46:01.57 3.0 undecidable manual S -0.47 0
IV.ZCCA.HHZ. 2023-09-18T07:45:57.18 3.0 undecidable manual S -1.35 0
IV.MOCL.EHZ. 2023-09-18T07:45:51.79 0.3 undecidable manual S 258 39.4272 50 0.45 67
IV.CRMI.HHZ. 2023-09-18T07:45:50.06 3.0 positive manual P 0.27 0
IV.RUFI.EHZ. 2023-09-18T07:45:48.28 0.3 undecidable manual S 205 29.5482 50 -0.4 69
IV.PSL.EHZ. 2023-09-18T07:45:48.90 3.0 negative manual P -0.21 0
IV.CRE.HHZ. 2023-09-18T07:45:48.35 3.0 negative manual P -1.14 0
IV.SEI.HHZ. 2023-09-18T07:45:47.29 0.1 undecidable manual S 264 24.5532 112 -0.01 100
IV.SFI.EHZ. 2023-09-18T07:45:47.19 0.3 undecidable manual S 143 24.2535 112 -0.01 75
IV.MPPT.EHZ. 2023-09-18T07:45:47.04 0.6 undecidable manual P 254 47.8188 50 0.01 48
IV.VISG.HHZ. 2023-09-18T07:45:46.44 0.1 undecidable manual S 304 21.9669 114 -0.05 100
IV.FNVD.HHZ. 2023-09-18T07:45:46.66 1.0 undecidable manual P 283 44.2224 50 0.18 23
IV.RINC.EHZ. 2023-09-18T07:45:46.64 0.1 undecidable manual S 192 21.867 114 0.19 97
IV.MOCL.EHZ. 2023-09-18T07:45:45.64 0.1 undecidable manual P 258 39.4272 50 -0.11 96
IV.IMOL.EHZ. 2023-09-18T07:45:45.48 0.6 undecidable manual P 11 31.6461 50 0.93 37
IV.VMGN.HHZ. 2023-09-18T07:45:45.41 0.3 undecidable manual S 217 17.3715 120 0.35 71
IV.RUFI.EHZ. 2023-09-18T07:45:44.04 0.1 undecidable manual P 205 29.5482 50 -0.17 96
IV.BOSL.HHZ. 2023-09-18T07:45:44.04 0.1 undecidable manual P 235 28.4493 50 -0.01 99
IV.SEI.HHZ. 2023-09-18T07:45:43.12 0.1 undecidable manual P 264 24.5532 112 -0.3 94
IV.SFI.EHZ. 2023-09-18T07:45:43.22 0.1 undecidable manual P 143 24.2535 112 -0.13 98
IV.VMGN.HHZ. 2023-09-18T07:45:42.19 0.3 undecidable manual P 217 17.3715 120 0.07 75
IV.VISG.HHZ. 2023-09-18T07:45:42.74 0.1 undecidable manual P 304 21.9669 114 -0.2 97
IV.RINC.EHZ. 2023-09-18T07:45:42.96 0.1 undecidable manual P 192 21.867 114 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:2.2 0.001381 0.46 AML other m 2023-09-18T07:45:45.74
IV.VISG.HHN. ML:2.0 0.0006195 0.44 AML other m 2023-09-18T07:45:46.58
IV.SFI.HNE. ML:2.4 0.001545 0.18 AML other m 2023-09-18T07:45:47.70
IV.SFI.EHE. ML:2.4 0.0015550000000000002 0.16 AML other m 2023-09-18T07:45:47.62
IV.SEI.HHE. ML:2.8 0.003745 0.24 AML other m 2023-09-18T07:45:47.63
IV.SEI.HHN. ML:3.2 0.01017 0.26 AML other m 2023-09-18T07:45:47.66
IV.VMGN.HHN. ML:2.2 0.0013250000000000002 1.32 AML other m 2023-09-18T07:45:47.67
IV.SFI.EHN. ML:2.4 0.001365 0.1 AML other m 2023-09-18T07:45:47.72
IV.SFI.HNN. ML:2.4 0.001355 0.12 AML other m 2023-09-18T07:45:47.71
IV.RINC.EHE. ML:2.3 0.0014 0.5 AML other m 2023-09-18T07:45:48.26
IV.RUFI.EHE. ML:1.7 0.0002575 0.56 AML other m 2023-09-18T07:45:49.13
IV.BOSL.HHN. ML:2.0 0.0004615 0.26 AML other m 2023-09-18T07:45:49.17
IV.RUFI.EHN. ML:2.3 0.0010170000000000001 1.54 AML other m 2023-09-18T07:45:49.98
IV.VISG.HHE. ML:1.9 0.000527 0.36 AML other m 2023-09-18T07:45:49.27
IV.BOSL.HHE. ML:1.8 0.0002965 0.72 AML other m 2023-09-18T07:45:49.98
IV.RINC.EHN. ML:2.4 0.00175 0.44 AML other m 2023-09-18T07:45:50.96
IV.MOCL.EHN. ML:2.6 0.0013450000000000003 0.66 AML other m 2023-09-18T07:45:52.17
IV.MOCL.EHE. ML:2.3 0.0006779999999999999 1.72 AML other m 2023-09-18T07:45:53.92
IV.IMOL.HNN. ML:2.4 0.001064 0.22 AML other m 2023-09-18T07:45:53.18
IV.CRE.HHE. ML:2.6 0.0009565 0.26 AML other m 2023-09-18T07:45:57.33
IV.CRE.HHN. ML:2.6 0.00103 0.26 AML other m 2023-09-18T07:45:57.32
IV.FNVD.HHN. ML:1.9 0.00023899999999999998 0.5 AML other m 2023-09-18T07:45:57.39
IV.FNVD.HHE. ML:2.2 0.000494 0.56 AML other m 2023-09-18T07:45:57.56
IV.MPPT.EHN. ML:1.9 0.0002235 0.28 AML other m 2023-09-18T07:45:57.74
IV.MPPT.EHE. ML:1.9 0.0002355 1.58 AML other m 2023-09-18T07:45:58.03
IV.CRMI.HHE. ML:1.5 0.0000553 1.64 AML other m 2023-09-18T07:45:58.09
IV.CRMI.HHN. ML:1.8 0.0001285 0.24 AML other m 2023-09-18T07:45:59.25
IV.IMOL.HNE. ML:2.4 0.00126 0.42 AML other m 2023-09-18T07:46:00.23
IV.CSNT.HHN. ML:2.0 0.00016549999999999998 1.48 AML other m 2023-09-18T07:46:05.18
IV.CSNT.HHE. ML:2.0 0.00013900000000000002 0.4 AML other m 2023-09-18T07:46:07.38
IV.ATVO.HHN. ML:1.9 0.00009240000000000001 0.58 AML other m 2023-09-18T07:46:12.16
IV.ATVO.HHE. ML:2.1 0.000126 0.34 AML other m 2023-09-18T07:46:12.49
IV.ATMI.HHN. ML:2.3 0.0002045 0.4 AML other m 2023-09-18T07:46:19.05
IV.ATMI.HHE. ML:2.2 0.00017999999999999998 0.44 AML other m 2023-09-18T07:46:23.46
IV.CING.HHE. ML:1.8 0.00003525 0.74 AML other m 2023-09-18T07:46:31.02
IV.CING.HHN. ML:1.9 0.00003915 0.62 AML other m 2023-09-18T07:46:35.36
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