Earthquake with magnitude of ML 3.4 on date 18-09-2023 and time 05:11:39 (Italy) in region 3 km SE Marradi (FI)

A magnitude ML 3.4 earthquake occured in region: 3 km SE Marradi (FI), on

  • 18-09-2023 03:11:39 (UTC)
  • 18-09-2023 05:11:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0510, 11.6350 at 7 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 9 1212 4351
Palazzuolo sul Senio FI 10 1154 5505
Portico e San Benedetto FC 12 756 6261
San Godenzo FI 14 1167 7428
Premilcuore FC 14 799 8227
Rocca San Casciano FC 17 1910 10137
Modigliana FC 17 4560 14697
Vicchio FI 19 8044 22741
Casola Valsenio RA 19 2617 25358
Dicomano FI 20 5515 30873

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Faenza (58541 inhabitants)
34 Km S of Imola (69797 inhabitants)
38 Km SW of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
47 Km E of Prato (191150 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
50 Km W of Cesena (96758 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
59 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
68 Km NW of Arezzo (99543 inhabitants)
74 Km W of Rimini (147750 inhabitants)
85 Km N of Siena (53903 inhabitants)
87 Km SE of Modena (184973 inhabitants)
87 Km S of Ferrara (133155 inhabitants)
94 Km E of Lucca (89046 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 3.4 2023-09-18
03:11:39
44.0513 11.6353 7 2023-09-21
10:30:16
Bollettino Sismico Italiano INGV 121229001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 03:11:39 ± 0.05
Latitude 44.0513 ± 0.0027
Longitude 11.6353 ± 0.0038
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 121229001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 278
Semi-minor axis of confidence ellipse (meter) 63
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 161
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 43
Number of associated phases, regardless of their use for origin computation 65
Number of defining phases 65
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.12141
Epicentral distance of station farthest from the epicenter (degree) 1.40564
Number of stations at which the event was observed 53
Number of stations from which data was used for origin computation 53
Magnitude information

ML:3.4

Field Value
Value 3.4
Uncertainty 0.3
Num. used stations 27
Type of magnitude ML
Reference to an origin 121229001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-09-20 15:27:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZOVE.HNZ. 2023-09-18T03:12:05.83 0.3 undecidable manual P 356 156.0216 50 0.83 0
TV.SF11.HHZ. 2023-09-18T03:12:02.42 1.0 undecidable manual P 178 131.2686 50 1.24 0
IV.ARCI.HHZ. 2023-09-18T03:12:02.82 0.6 undecidable manual P 186 133.6662 50 1.26 0
IV.RIBO.EHZ. 2023-09-18T03:12:01.52 0.6 undecidable manual P 201 131.1687 50 0.35 0
IV.TRIF.CHZ. 2023-09-18T03:12:00.82 0.6 undecidable manual P 210 119.3916 50 1.46 0
IV.OSSC.HHE. 2023-09-18T03:12:00.40 0.6 undecidable manual S 208 66.2781 50 0.31 12
IV.MALA5.EHN. 2023-09-18T03:11:59.77 0.6 undecidable manual P 186 116.4945 50 0.85 0
IV.ATSC.EHE. 2023-09-18T03:11:59.13 0.3 undecidable manual P 129 109.3128 50 1.33 0
IV.MALA0.EHN. 2023-09-18T03:11:59.67 0.6 undecidable manual P 186 116.6943 50 0.73 0
IV.MALA2.EHN. 2023-09-18T03:11:59.67 0.3 undecidable manual P 186 116.8941 50 0.69 0
IV.FRON.EHZ. 2023-09-18T03:11:58.92 1.0 undecidable manual P 124 105.5166 50 1.71 0
MN.VLC.HHZ. 2023-09-18T03:11:57.39 0.3 undecidable manual P 277 100.2219 50 0.99 0
IV.CRE.HHN. 2023-09-18T03:11:57.00 0.6 undecidable manual S 152 54.2013 50 0.14 35
IV.ATVA.EHE. 2023-09-18T03:11:57.76 1.0 undecidable manual P 148 100.3218 50 1.34 0
IV.FROS.CHE. 2023-09-18T03:11:57.58 0.3 undecidable manual P 203 100.9212 50 1.06 0
IV.PESA.HHE. 2023-09-18T03:11:57.35 1.0 undecidable manual P 97 96.9252 50 1.46 0
IV.PSL.EHZ. 2023-09-18T03:11:57.71 0.6 undecidable manual S 265 56.5989 50 0.22 30
IV.TB03.DH1.05 2023-09-18T03:11:56.63 0.3 undecidable manual P 139 95.1381 50 1 0
IV.ATMI.HHZ. 2023-09-18T03:11:56.89 0.6 undecidable manual P 147 94.3389 50 1.39 0
GU.MAIM.HHZ. 2023-09-18T03:11:56.68 0.3 undecidable manual P 261 92.5407 50 1.46 0
IV.PIEI.HNN. 2023-09-18T03:11:55.64 0.3 undecidable manual P 128 91.9413 50 0.51 0
IV.APEC.HNN. 2023-09-18T03:11:55.12 0.3 undecidable manual P 131 83.25 50 1.33 0
IV.ATPC.HHE. 2023-09-18T03:11:55.05 0.6 undecidable manual P 134 91.3419 50 0.02 0
IV.TSM6.DH1.11 2023-09-18T03:11:54.97 0.3 undecidable manual P 139 85.1481 50 0.89 0
IV.LOCA.HHN. 2023-09-18T03:11:54.74 0.3 undecidable manual P 200 87.8454 50 0.24 0
IV.MCIF.HNE. 2023-09-18T03:11:54.77 0.3 undecidable manual P 108 83.9493 50 0.88 0
IV.CAFI.HNN. 2023-09-18T03:11:54.27 0.3 undecidable manual P 162 84.3489 50 0.31 0
IV.FNVD.HHE. 2023-09-18T03:11:53.50 0.6 undecidable manual S 288 42.8238 50 -0.31 46
GU.POPM.HHZ. 2023-09-18T03:11:53.60 0.3 undecidable manual P 270 70.0743 50 1.85 5
IV.CDCA.HNZ. 2023-09-18T03:11:53.50 0.3 undecidable manual P 144 81.3519 50 0 0
IV.ATMC.EHE. 2023-09-18T03:11:53.24 0.3 undecidable manual P 146 80.5638 50 -0.13 0
IV.CSNT.HHZ. 2023-09-18T03:11:52.04 0.6 undecidable manual P 203 69.8745 50 0.32 7
VM.SSCV.HNZ. 2023-09-18T03:11:52.55 0.3 undecidable manual P 113 75.1692 50 0 3
IV.BADI.EHE. 2023-09-18T03:11:52.82 0.3 undecidable manual P 141 77.367 50 -0.06 1
IV.CPGN.EHZ. 2023-09-18T03:11:51.13 0.3 undecidable manual P 117 61.3941 50 0.71 28
IV.OSSC.HHE. 2023-09-18T03:11:51.85 0.3 undecidable manual P 208 66.2781 50 0.67 16
IV.BLLA.EHE. 2023-09-18T03:11:51.84 0.6 undecidable manual P 81 67.2771 50 0.51 10
IV.MOCL.EHN. 2023-09-18T03:11:51.60 0.6 undecidable manual S 262 36.6411 101 -0.34 47
IV.CRMI.HNN. 2023-09-18T03:11:50.41 0.3 undecidable manual P 242 59.5959 50 0.27 37
IV.PARC.HHN. 2023-09-18T03:11:50.97 0.6 undecidable manual P 133 65.7897 50 -0.12 14
IV.PSL.EHZ. 2023-09-18T03:11:49.50 0.3 undecidable manual P 265 56.5989 50 -0.18 46
IV.CRE.HHN. 2023-09-18T03:11:48.85 0.3 undecidable manual P 152 54.2013 50 -0.47 49
IV.RUFI.EHZ. 2023-09-18T03:11:48.30 0.6 undecidable manual S 203 25.752 105 0.05 50
IV.MPPT.EHN. 2023-09-18T03:11:48.55 0.3 undecidable manual P 257 44.7219 50 0.7 61
IV.BOSL.HHE. 2023-09-18T03:11:48.32 0.6 undecidable manual S 237 24.753 106 0.4 46
IV.FIR.HHN. 2023-09-18T03:11:47.42 0.3 undecidable manual P 225 43.2234 50 -0.2 71
IV.SEI.HHZ. 2023-09-18T03:11:47.10 0.6 undecidable manual S 271 22.0668 107 0.06 50
IV.FNVD.HHE. 2023-09-18T03:11:47.10 0.3 undecidable manual P 288 42.8238 50 -0.46 68
IV.SFI.EHZ. 2023-09-18T03:11:47.40 0.3 undecidable manual S 134 23.4543 106 -0.09 74
IV.MOCL.EHN. 2023-09-18T03:11:46.03 0.3 undecidable manual P 262 36.6411 101 -0.44 69
IT.FAZ.HNZ. 2023-09-18T03:11:46.30 0.3 undecidable manual P 36 34.0437 101 0.32 70
IT.FIE.HGE. 2023-09-18T03:11:46.35 0.3 undecidable manual P 225 38.4282 100 -0.48 68
IV.MTRZ.HNZ. 2023-09-18T03:11:46.65 0.6 undecidable manual P 330 33.5442 102 0.79 40
IV.IMOL.HNZ. 2023-09-18T03:11:46.32 0.3 undecidable manual P 14 35.2425 101 0.12 74
IV.VISG.HHZ. 2023-09-18T03:11:46.90 0.6 undecidable manual S 314 22.1556 107 -0.15 49
IV.RINC.EHN. 2023-09-18T03:11:45.70 0.6 undecidable manual S 187 18.4704 111 -0.14 49
IV.VMGN.HHE. 2023-09-18T03:11:45.00 0.6 undecidable manual S 217 13.4754 117 0.73 41
IV.FAEN.HNZ. 2023-09-18T03:11:45.99 0.3 undecidable manual P 36 32.6451 102 0.29 71
IV.RUFI.EHZ. 2023-09-18T03:11:44.21 0.1 undecidable manual P 203 25.752 105 -0.13 98
IV.BOSL.HHE. 2023-09-18T03:11:44.17 0.3 undecidable manual P 237 24.753 106 0.01 75
IV.SEI.HHZ. 2023-09-18T03:11:43.48 0.3 undecidable manual P 271 22.0668 107 -0.16 73
IV.SFI.EHZ. 2023-09-18T03:11:43.70 0.1 undecidable manual P 134 23.4543 106 -0.2 96
IV.VISG.HHZ. 2023-09-18T03:11:43.49 0.3 undecidable manual P 314 22.1556 107 -0.16 73
IV.RINC.EHN. 2023-09-18T03:11:43.09 0.1 undecidable manual P 187 18.4704 111 0.14 98
IV.VMGN.HHE. 2023-09-18T03:11:42.36 0.1 undecidable manual P 217 13.4754 117 0.31 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:3.5 0.035668374999999995 0.5408 AML other m 2023-09-18T03:11:45.43
IV.VMGN.HHN. ML:3.5 0.03636767 0.4 AML other m 2023-09-18T03:11:45.28
IV.RINC.EHN. ML:3.6 0.036509839999999995 0.8208 AML other m 2023-09-18T03:11:46.62
IV.RINC.EHE. ML:3.6 0.03788123 0.5616 AML other m 2023-09-18T03:11:47.33
IV.VISG.HHE. ML:3.1 0.009859999999999999 0.98 AML other m 2023-09-18T03:11:47.25
IV.VISG.HHN. ML:3.2 0.011365 0.36 AML other m 2023-09-18T03:11:47.15
IV.SFI.HNE. ML:3.4 0.016949759999999998 0.3008 AML other m 2023-09-18T03:11:47.56
IV.SFI.EHE. ML:3.4 0.016869219999999997 0.3008 AML other m 2023-09-18T03:11:47.56
IV.SFI.EHN. ML:3.3 0.0121900695 0.2608 AML other m 2023-09-18T03:11:47.97
IV.RUFI.EHE. ML:3.0 0.005698427000000001 0.3808 AML other m 2023-09-18T03:11:48.38
IV.BOSL.HHN. ML:3.2 0.0098818655 0.4608 AML other m 2023-09-18T03:11:48.67
IV.RUFI.EHN. ML:3.7 0.029857554999999997 0.48 AML other m 2023-09-18T03:11:48.67
IV.BOSL.HHE. ML:2.9 0.004659026500000001 0.6 AML other m 2023-09-18T03:11:48.95
IV.SEI.HHN. ML:4.0 0.06415000000000001 0.32 AML other m 2023-09-18T03:11:50.21
IV.SEI.HHE. ML:3.9 0.0615 0.38 AML other m 2023-09-18T03:11:51.25
IV.SFI.HNN. ML:3.3 0.014908176 0.4688 AML other m 2023-09-18T03:11:51.97
IV.MOCL.EHE. ML:3.3 0.007702323999999999 0.3616 AML other m 2023-09-18T03:11:52.01
IV.MOCL.EHN. ML:3.5 0.012528894999999998 0.3792 AML other m 2023-09-18T03:11:52.01
IV.FIR.HNN. ML:3.4 0.009353295 0.4896 AML other m 2023-09-18T03:11:54.24
IV.FIR.HHN. ML:3.4 0.009319027 0.48 AML other m 2023-09-18T03:11:54.24
IV.FNVD.HHN. ML:2.8 0.002323503 0.3008 AML other m 2023-09-18T03:11:54.45
IV.MTRZ.HHE. ML:3.7 0.021727332499999998 0.32 AML other m 2023-09-18T03:11:54.71
IV.MTRZ.HNE. ML:3.7 0.020951678 0.3408 AML other m 2023-09-18T03:11:54.72
IV.MTRZ.HNN. ML:3.7 0.02108061 0.3712 AML other m 2023-09-18T03:11:54.63
IV.CRE.HHE. ML:3.3 0.004464122 0.2992 AML other m 2023-09-18T03:11:57.13
IV.CRE.HHN. ML:3.7 0.012141204999999999 0.4416 AML other m 2023-09-18T03:11:57.68
IV.OSSC.HHE. ML:3.1 0.0021395357 0.2608 AML other m 2023-09-18T03:12:00.73
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download