Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 18-09-2023 and time 06:07:44 (UTC) in region 1 km S Marradi (FI)

A magnitude ML 2.2 earthquake occured in region: 1 km S Marradi (FI), on

  • 18-09-2023 06:07:44 (UTC)
  • 18-09-2023 08:07:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0630, 11.6120 at 9 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 2 3139 3139
Palazzuolo sul Senio FI 8 1154 4293
Tredozio FC 11 1212 5505
Portico e San Benedetto FC 14 756 6261
San Godenzo FI 15 1167 7428
Premilcuore FC 16 799 8227
Casola Valsenio RA 18 2617 10844
Modigliana FC 18 4560 15404
Vicchio FI 18 8044 23448
Rocca San Casciano FC 19 1910 25358
Castel del Rio BO 19 1246 26604
Firenzuola FI 20 4726 31330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
33 Km S of Imola (69797 inhabitants)
39 Km W of Forlì (117913 inhabitants)
43 Km NE of Firenze (382808 inhabitants)
46 Km E of Prato (191150 inhabitants)
48 Km NE of Scandicci (50609 inhabitants)
51 Km W of Cesena (96758 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
57 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
70 Km NW of Arezzo (99543 inhabitants)
76 Km W of Rimini (147750 inhabitants)
85 Km SE of Modena (184973 inhabitants)
86 Km N of Siena (53903 inhabitants)
86 Km S of Ferrara (133155 inhabitants)
92 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 2.2 2023-09-18
06:07:44		 44.0633 11.6117 9 2023-09-18
06:37:38		 Sala Sismica INGV-Roma 121166001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 06:07:44 ± 0.08
Latitude 44.0633 ± 0.0036
Longitude 11.6117 ± 0.0050
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121166001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 367
Semi-minor axis of confidence ellipse (meter) 304
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 227
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) 114
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.71766
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 16
Magnitude information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 121166001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 06:37:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CADA.HNZ. 2023-09-18T06:08:20.43 3.0 positive manual Pg 5.65 0
ST.VARA.EHZ. 2023-09-18T06:08:16.79 3.0 undecidable manual Pn 1.28 0
IV.CSP1.EHZ. 2023-09-18T06:08:15.29 3.0 positive manual P 4.33 0
IV.ATVO.HHZ. 2023-09-18T06:08:15.37 3.0 undecidable manual S -0.13 0
IV.NARO.HHZ. 2023-09-18T06:08:14.04 3.0 undecidable manual S 0.32 0
IV.ATPI.EHZ. 2023-09-18T06:08:13.45 3.0 undecidable manual S -0.31 0
GU.EQUI.HHZ. 2023-09-18T06:08:05.20 3.0 negative manual P 0.56 0
IV.ARVD.HHZ. 2023-09-18T06:08:03.77 3.0 undecidable manual P -1.81 0
IV.ATVO.HHZ. 2023-09-18T06:08:01.42 3.0 negative manual P -0.31 0
IV.ATPI.EHZ. 2023-09-18T06:08:00.30 3.0 negative manual P -0.45 0
IV.NARO.HHZ. 2023-09-18T06:07:59.92 3.0 positive manual P -0.81 0
IV.PE3.EHZ. 2023-09-18T06:07:59.26 3.0 positive manual P 0.31 0
IV.BADI.EHZ. 2023-09-18T06:07:58.46 1.0 undecidable manual P 140 79.6647 50 0.41 21
IV.MOCL.EHZ. 2023-09-18T06:07:56.29 0.6 undecidable manual S 259 34.9428 50 -0.09 48
IV.OSSC.HHZ. 2023-09-18T06:07:56.23 0.6 undecidable manual P 206 66.6777 50 0.17 45
IV.CSNT.HHZ. 2023-09-18T06:07:56.87 0.1 undecidable manual P 202 70.374 50 0.24 87
IV.PARC.HHZ. 2023-09-18T06:07:56.10 0.6 undecidable manual P 132 68.0763 50 -0.17 45
IV.CRMI.HHZ. 2023-09-18T06:07:55.10 0.3 undecidable manual P 240 58.5969 50 0.29 66
IV.BOSL.HHZ. 2023-09-18T06:07:53.02 0.3 undecidable manual S 232 23.9538 110 0.11 73
IV.SFI.HNZ. 2023-09-18T06:07:53.41 0.3 undecidable manual S 133 25.752 109 -0.08 74
IV.RUFI.EHZ. 2023-09-18T06:07:53.39 0.3 undecidable manual S 198 26.2515 108 -0.28 71
IV.MPPT.EHZ. 2023-09-18T06:07:52.17 0.3 undecidable manual P 254 43.2234 50 -0.27 69
IV.RINC.EHZ. 2023-09-18T06:07:51.63 0.3 undecidable manual S 181 19.6692 114 0.12 74
IV.IMOL.EHZ. 2023-09-18T06:07:51.72 0.6 undecidable manual P 18 34.4433 50 0.63 42
IV.VISG.HHZ. 2023-09-18T06:07:51.44 0.3 undecidable manual S 315 19.869 114 -0.14 73
IV.SEI.HHZ. 2023-09-18T06:07:51.91 0.3 undecidable manual S 267 20.1687 113 0.22 72
IV.MOCL.EHZ. 2023-09-18T06:07:50.75 0.1 undecidable manual P 259 34.9428 50 -0.42 90
IV.MTRZ.HHZ. 2023-09-18T06:07:50.80 0.1 undecidable manual P 332 31.4463 105 0.21 95
IV.RUFI.EHZ. 2023-09-18T06:07:49.43 0.1 undecidable manual P 198 26.2515 108 -0.18 96
IV.VMGN.HHZ. 2023-09-18T06:07:49.87 0.3 undecidable manual S 208 13.5753 123 0.2 73
IV.BOSL.HHZ. 2023-09-18T06:07:49.17 0.1 undecidable manual P 232 23.9538 110 0 100
IV.SFI.HNZ. 2023-09-18T06:07:49.28 0.1 undecidable manual P 133 25.752 109 -0.22 95
IV.SEI.HHZ. 2023-09-18T06:07:48.31 0.1 undecidable manual P 267 20.1687 113 -0.16 98
IV.RINC.EHZ. 2023-09-18T06:07:48.42 0.1 undecidable manual P 181 19.6692 114 0.06 100
IV.VISG.HHZ. 2023-09-18T06:07:48.22 0.1 undecidable manual P 315 19.869 114 -0.18 97
IV.VMGN.HHZ. 2023-09-18T06:07:47.50 0.1 undecidable manual P 208 13.5753 123 0.2 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:2.2 0.0017605 1.58 AML other m 2023-09-18T06:07:50.95
IV.RINC.EHE. ML:2.2 0.0013599999999999999 0.14 AML other m 2023-09-18T06:07:51.71
IV.VISG.HHN. ML:2.4 0.00209 0.12 AML other m 2023-09-18T06:07:52.29
IV.VMGN.HHN. ML:2.0 0.00124 0.66 AML other m 2023-09-18T06:07:52.29
IV.RINC.EHN. ML:2.4 0.00183 0.42 AML other m 2023-09-18T06:07:52.43
IV.BOSL.HHE. ML:1.6 0.000247 0.84 AML other m 2023-09-18T06:07:53.63
IV.BOSL.HHN. ML:1.7 0.0003395 0.46 AML other m 2023-09-18T06:07:53.31
IV.RUFI.EHN. ML:2.2 0.0008925000000000001 1.44 AML other m 2023-09-18T06:07:54.74
IV.SFI.HNN. ML:2.4 0.001585 0.22 AML other m 2023-09-18T06:07:54.06
IV.SFI.EHN. ML:2.4 0.001625 1.6 AML other m 2023-09-18T06:07:54.07
IV.SFI.HNE. ML:2.4 0.0016749999999999998 0.62 AML other m 2023-09-18T06:07:54.15
IV.SFI.EHE. ML:2.4 0.00161 0.6 AML other m 2023-09-18T06:07:54.16
IV.VISG.HHE. ML:2.1 0.0009725000000000001 1.32 AML other m 2023-09-18T06:07:54.21
IV.RUFI.EHE. ML:1.9 0.000434 0.54 AML other m 2023-09-18T06:07:54.49
IV.SEI.HHN. ML:2.6 0.002845 1.72 AML other m 2023-09-18T06:07:55.95
IV.MOCL.EHE. ML:2.0 0.00041900000000000005 0.28 AML other m 2023-09-18T06:07:56.48
IV.MOCL.EHN. ML:2.1 0.000532 0.42 AML other m 2023-09-18T06:07:56.62
IV.SEI.HHE. ML:2.4 0.00181 0.54 AML other m 2023-09-18T06:07:58.76
IV.FNVD.HHN. ML:2.0 0.00033699999999999995 1.56 AML other m 2023-09-18T06:07:59.95
IV.FNVD.HHE. ML:2.4 0.0008485000000000001 0.34 AML other m 2023-09-18T06:07:59.03
IV.IMOL.HNE. ML:2.3 0.000862 0.62 AML other m 2023-09-18T06:07:59.53
IV.MTRZ.HNN. ML:2.3 0.0009715 1.68 AML other m 2023-09-18T06:08:00.92
IV.MTRZ.HHN. ML:2.3 0.0009850000000000002 1.7 AML other m 2023-09-18T06:08:00.92
IV.MTRZ.HNE. ML:2.4 0.0010865 0.36 AML other m 2023-09-18T06:08:01.84
IV.MTRZ.HHE. ML:2.4 0.0011175 0.36 AML other m 2023-09-18T06:08:01.84
IV.IMOL.HNN. ML:2.4 0.000989 0.28 AML other m 2023-09-18T06:08:01.65
IV.MPPT.EHE. ML:1.7 0.0001705 0.84 AML other m 2023-09-18T06:08:02.47
IV.MPPT.EHN. ML:1.8 0.00019350000000000001 0.32 AML other m 2023-09-18T06:08:02.40
IV.OSSC.HHE. ML:2.3 0.0003495 0.6 AML other m 2023-09-18T06:08:05.87
IV.CRMI.HHN. ML:1.8 0.00013550000000000001 0.42 AML other m 2023-09-18T06:08:06.11
IV.PARC.HHE. ML:1.9 0.0001485 0.3 AML other m 2023-09-18T06:08:06.52
IV.CRMI.HHE. ML:1.6 0.00008360000000000001 0.66 AML other m 2023-09-18T06:08:06.67
GU.POPM.HHN. ML:2.0 0.00016700000000000002 0.22 AML other m 2023-09-18T06:08:07.64
GU.POPM.HHE. ML:1.9 0.00014600000000000003 0.18 AML other m 2023-09-18T06:08:07.65
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