Earthquake with magnitude of ML 2.6 on date 20-09-2023 and time 00:35:11 (Italy) in region 3 km E Marradi (FI)

A magnitude ML 2.6 earthquake occured in region: 3 km E Marradi (FI), on

  • 19-09-2023 22:35:11 (UTC)
  • 20-09-2023 00:35:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0800, 11.6510 at 5 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.

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 8 1212 4351
Palazzuolo sul Senio FI 9 1154 5505
Portico e San Benedetto FC 12 756 6261
Modigliana FC 14 4560 10821
Premilcuore FC 15 799 11620
Rocca San Casciano FC 16 1910 13530
Casola Valsenio RA 16 2617 16147
San Godenzo FI 17 1167 17314
Brisighella RA 18 7639 24953
Castel del Rio BO 19 1246 26199
Dovadola FC 20 1653 27852

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Faenza (58541 inhabitants)
31 Km S of Imola (69797 inhabitants)
35 Km W of Forlì (117913 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
48 Km W of Cesena (96758 inhabitants)
49 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
52 Km SE of Bologna (386663 inhabitants)
58 Km SW of Ravenna (159116 inhabitants)
61 Km E of Pistoia (90315 inhabitants)
71 Km N of Arezzo (99543 inhabitants)
73 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
85 Km SE of Modena (184973 inhabitants)
88 Km NE of Siena (53903 inhabitants)
96 Km E of Lucca (89046 inhabitants)
99 Km SE of Carpi (70699 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, 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 ( 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.
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
ML 2.6 2023-09-19
44.0803 11.6508 5 2023-09-19
Sala Sismica INGV-Roma 121248101
Preferred location and magnitude until now.
Origin information


Field Value
Time (UTC) 2023-09-19 22:35:11 ± 0.12
Latitude 44.0803 ± 0.0045
Longitude 11.6508 ± 0.0063
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121248101


Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 538
Semi-minor axis of confidence ellipse (meter) 289
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 317
Circular confidence region, given by single value of horizontal uncertainty (meter) 540.0
Confidence level of the uncertainty (%) 68


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 52
Number of defining phases 16
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) 0.28688
Number of stations at which the event was observed 43
Number of stations from which data was used for origin computation 9
Magnitude information


Field Value
Value 2.6
Uncertainty 0.3
Num. used stations 62
Type of magnitude ML
Reference to an origin 121248101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-19 22:40:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
SI.BOSI.HHZ. 2023-09-19T22:36:21.86 3.0 undecidable manual Sn -0.22 0
OX.MLN.HHZ. 2023-09-19T22:36:16.39 3.0 undecidable manual Sn 0.28 0
MN.TRI.HHZ. 2023-09-19T22:36:15.61 3.0 undecidable manual Sn -1.39 0
IV.TRIF.CHZ. 2023-09-19T22:35:49.20 3.0 undecidable manual S 0.04 0
IV.SMA1.EHZ. 2023-09-19T22:35:49.11 3.0 positive manual Pg 5.42 0
SI.LUSI.HHZ. 2023-09-19T22:35:49.97 3.0 negative manual Pg 5.44 0
IV.FIAM.HHZ. 2023-09-19T22:35:47.22 3.0 undecidable manual Pn 0.75 0
IV.MF5.EHZ. 2023-09-19T22:35:45.14 3.0 undecidable manual Pg 4.03 0
IV.FDMO.HHZ. 2023-09-19T22:35:41.19 3.0 negative manual P 3.3 0
IV.ZOVE.EHZ. 2023-09-19T22:35:38.17 3.0 positive manual P 1.39 0
IV.MGAB.HHZ. 2023-09-19T22:35:36.37 3.0 negative manual P 2.17 0
GU.POPM.HHZ. 2023-09-19T22:35:35.00 3.0 undecidable manual S 0.38 0
IV.OSSC.HHZ. 2023-09-19T22:35:34.03 3.0 undecidable manual S 0.19 0
IV.ARVD.HHZ. 2023-09-19T22:35:32.34 3.0 negative manual P -0.45 0
GU.GSCL.HHZ. 2023-09-19T22:35:30.62 3.0 positive manual P 2.96 0
GU.MAIM.HHZ. 2023-09-19T22:35:28.65 3.0 negative manual P 0.35 0
IV.ATVO.HHZ. 2023-09-19T22:35:28.76 3.0 positive manual P -0.27 0
IV.ATMI.HHZ. 2023-09-19T22:35:28.68 3.0 positive manual P 0.01 0
IV.NARO.HHZ. 2023-09-19T22:35:27.30 3.0 positive manual P -0.58 0
IV.CAFI.HHZ. 2023-09-19T22:35:27.05 3.0 positive manual P 0.01 0
IV.PIEI.HHZ. 2023-09-19T22:35:27.50 3.0 positive manual P -0.72 0
IV.ZCCA.HHZ. 2023-09-19T22:35:25.27 3.0 negative manual P 2.29 0
IV.CSNT.HHZ. 2023-09-19T22:35:25.47 3.0 undecidable manual P 0.83 0
IV.OSSC.HHZ. 2023-09-19T22:35:24.06 3.0 undecidable manual P 0.01 0
GU.POPM.HHZ. 2023-09-19T22:35:24.14 3.0 negative manual P -0.35 0
IV.PARC.HHZ. 2023-09-19T22:35:23.43 3.0 undecidable manual P -0.42 0
IV.CRMI.HHZ. 2023-09-19T22:35:22.94 3.0 negative manual P 0.09 0
IV.BOSL.HHZ. 2023-09-19T22:35:22.00 0.3 undecidable manual S 233 27.5502 101 0.5 65
IV.RUFI.EHZ. 2023-09-19T22:35:22.14 0.3 undecidable manual S 203 29.1486 100 0.11 71
IV.PSL.EHZ. 2023-09-19T22:35:22.00 3.0 undecidable manual P -0.26 0
IV.CRE.HHZ. 2023-09-19T22:35:21.61 3.0 positive manual P -0.37 0
IV.RINC.EHZ. 2023-09-19T22:35:20.00 0.3 undecidable manual S 189 21.7671 104 0.47 67
IV.BRSN.EHZ. 2023-09-19T22:35:20.39 3.0 negative manual P 0.56 0
IV.SEI.HHZ. 2023-09-19T22:35:20.12 0.3 undecidable manual S 263 23.4543 103 0.02 73
IV.MPPT.EHZ. 2023-09-19T22:35:20.29 3.0 negative manual P -0.01 0
IV.FNVD.HHZ. 2023-09-19T22:35:19.13 3.0 undecidable manual P -0.71 0
IV.IMOL.EHZ. 2023-09-19T22:35:18.50 0.1 positive manual P 13 31.8459 99 0.29 91
IV.MTRZ.HHZ. 2023-09-19T22:35:18.24 0.1 positive manual P 325 31.4463 100 0.11 94
IV.MOCL.EHZ. 2023-09-19T22:35:18.76 3.0 positive manual P -0.17 0
IV.RUFI.EHZ. 2023-09-19T22:35:17.32 0.1 positive manual P 203 29.1486 100 -0.37 90
IT.MOG.HNZ. 2023-09-19T22:35:17.04 0.3 undecidable manual S 43 13.5753 111 0.23 71
IV.BOSL.HHZ. 2023-09-19T22:35:17.18 0.1 positive manual P 233 27.5502 101 -0.2 93
IV.SEI.HHZ. 2023-09-19T22:35:16.20 0.1 positive manual P 263 23.4543 103 -0.37 90
IV.SFI.EHZ. 2023-09-19T22:35:16.61 3.0 negative manual P -0.12 0
IV.RINC.EHZ. 2023-09-19T22:35:16.18 0.1 positive manual P 189 21.7671 104 -0.06 97
IV.VISG.HHZ. 2023-09-19T22:35:15.74 3.0 positive manual P -0.4 0
IV.VMGN.HHZ. 2023-09-19T22:35:15.38 3.0 positive manual P 0.35 0
IT.MOG.HNZ. 2023-09-19T22:35:14.56 0.1 undecidable manual P 43 13.5753 111 -0.11 97
IV.LMD.HHZ. 2023-09-19T22:35:14.12 0.1 undecidable manual S 94 4.4955 139 -0.04 100
IT.MRR.HGZ. 2023-09-19T22:35:14.10 0.3 undecidable manual S 245 4.1958 141 0.01 75
IT.MRR.HGZ. 2023-09-19T22:35:13.02 0.1 undecidable manual P 245 4.1958 141 -0.08 99
IV.LMD.HHZ. 2023-09-19T22:35:12.99 0.1 undecidable manual P 94 4.4955 139 -0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:2.6 0.004070000000000001 1.56 AML other m 2023-09-19T22:35:18.94
IV.SEI.HHE. ML:3.0 0.007285 0.46 AML other m 2023-09-19T22:35:20.53
IV.SEI.HHN. ML:3.3 0.01325 0.34 AML other m 2023-09-19T22:35:20.61
IV.VMGN.HHN. ML:2.7 0.00468 1.66 AML other m 2023-09-19T22:35:20.86
IV.SFI.EHE. ML:2.7 0.00339 1.66 AML other m 2023-09-19T22:35:20.90
IV.SFI.HNE. ML:2.7 0.003345 1.68 AML other m 2023-09-19T22:35:20.90
IV.RINC.EHE. ML:2.8 0.005425 0.4 AML other m 2023-09-19T22:35:21.66
IV.SFI.HNN. ML:2.6 0.00243 0.4 AML other m 2023-09-19T22:35:21.28
IV.SFI.EHN. ML:2.6 0.0024349999999999997 0.4 AML other m 2023-09-19T22:35:21.28
IV.BOSL.HHN. ML:2.5 0.001685 0.32 AML other m 2023-09-19T22:35:22.24
IV.BOSL.HHE. ML:2.4 0.0013 0.68 AML other m 2023-09-19T22:35:22.26
IV.VISG.HHN. ML:2.6 0.0027249999999999996 0.44 AML other m 2023-09-19T22:35:22.16
IV.RUFI.EHN. ML:2.8 0.003175 0.38 AML other m 2023-09-19T22:35:22.24
IV.RUFI.EHE. ML:2.2 0.0009395 0.3 AML other m 2023-09-19T22:35:22.43
IV.RINC.EHN. ML:2.9 0.006185 0.5 AML other m 2023-09-19T22:35:23.58
IV.VISG.HHE. ML:2.4 0.0018250000000000002 0.84 AML other m 2023-09-19T22:35:24.53
IV.MOCL.EHE. ML:2.5 0.0011899999999999999 0.2 AML other m 2023-09-19T22:35:25.18
IV.MOCL.EHN. ML:2.6 0.00147 0.44 AML other m 2023-09-19T22:35:25.38
IV.MTRZ.HHE. ML:2.9 0.003945000000000001 0.52 AML other m 2023-09-19T22:35:28.02
IV.MTRZ.HNE. ML:2.9 0.0039049999999999996 0.52 AML other m 2023-09-19T22:35:28.03
IV.FNVD.HHN. ML:2.2 0.00045999999999999996 0.36 AML other m 2023-09-19T22:35:28.46
IV.FNVD.HHE. ML:2.8 0.002345 0.54 AML other m 2023-09-19T22:35:28.76
IV.MTRZ.HHN. ML:3.0 0.005105 0.48 AML other m 2023-09-19T22:35:29.50
IV.MTRZ.HNN. ML:3.0 0.004810000000000001 0.46 AML other m 2023-09-19T22:35:29.50
IV.CRE.HHN. ML:3.1 0.002855 0.24 AML other m 2023-09-19T22:35:30.73
IV.IMOL.EHN. ML:2.5 0.00148 0.36 AML other m 2023-09-19T22:35:30.68
IV.CRE.HHE. ML:2.9 0.00171 0.26 AML other m 2023-09-19T22:35:30.86
IV.MPPT.EHN. ML:2.4 0.0007224999999999999 0.5 AML other m 2023-09-19T22:35:31.92
IV.MPPT.EHE. ML:2.4 0.0008129999999999999 1 AML other m 2023-09-19T22:35:31.39
IV.CRMI.HHN. ML:2.3 0.0003845 0.36 AML other m 2023-09-19T22:35:32.16
IV.CRMI.HNN. ML:2.2 0.000352 0.38 AML other m 2023-09-19T22:35:32.16
IV.IMOL.EHE. ML:2.5 0.0015459999999999998 0.9 AML other m 2023-09-19T22:35:33.57
IV.IMOL.HNE. ML:2.8 0.003175 0.5 AML other m 2023-09-19T22:35:33.47
IV.PSL.EHE. ML:2.7 0.0010475 0.38 AML other m 2023-09-19T22:35:33.72
IV.IMOL.HNN. ML:2.9 0.003855 1.46 AML other m 2023-09-19T22:35:33.98
IV.PSL.EHN. ML:2.4 0.0005430000000000001 0.32 AML other m 2023-09-19T22:35:34.22
IV.OSSC.HHE. ML:2.6 0.000741 1.38 AML other m 2023-09-19T22:35:34.75
IV.BRSN.HNN. ML:2.9 0.0029649999999999998 0.4 AML other m 2023-09-19T22:35:35.33
IV.BRSN.EHN. ML:3.0 0.0030600000000000002 0.42 AML other m 2023-09-19T22:35:35.34
GU.POPM.HHN. ML:2.3 0.0003415 0.36 AML other m 2023-09-19T22:35:36.16
IV.CRMI.HNE. ML:2.2 0.0003415 0.36 AML other m 2023-09-19T22:35:36.71
IV.CRMI.HHE. ML:2.1 0.000237 0.74 AML other m 2023-09-19T22:35:36.71
GU.POPM.HHE. ML:2.2 0.00027600000000000004 1.7 AML other m 2023-09-19T22:35:37.01
IV.CSNT.HHE. ML:2.5 0.0004875 1.2 AML other m 2023-09-19T22:35:38.26
IV.CSNT.HHN. ML:2.6 0.000618 0.64 AML other m 2023-09-19T22:35:38.29
IV.BRSN.EHE. ML:2.9 0.00285 0.56 AML other m 2023-09-19T22:35:38.62
IV.BRSN.HNE. ML:3.0 0.00366 0.56 AML other m 2023-09-19T22:35:38.64
IV.OSSC.HHN. ML:2.7 0.0009105000000000001 1.24 AML other m 2023-09-19T22:35:39.10
IV.PARC.HHE. ML:2.4 0.000393 0.36 AML other m 2023-09-19T22:35:40.46
IV.PARC.HHN. ML:2.4 0.000402 1.42 AML other m 2023-09-19T22:35:41.86
IV.CAFI.HHN. ML:2.4 0.0003275 1.12 AML other m 2023-09-19T22:35:43.80
IV.CAFI.HHE. ML:2.7 0.000623 0.66 AML other m 2023-09-19T22:35:44.74
IV.ATVO.HHE. ML:2.7 0.0005535 0.4 AML other m 2023-09-19T22:35:46.22
IV.NARO.HHE. ML:2.2 0.000176 0.46 AML other m 2023-09-19T22:35:46.71
IV.ATMI.HHN. ML:2.8 0.0007865 1.58 AML other m 2023-09-19T22:35:46.09
GU.MAIM.HHN. ML:2.3 0.0002365 1.48 AML other m 2023-09-19T22:35:47.20
GU.MAIM.HHE. ML:2.1 0.00015099999999999998 1.26 AML other m 2023-09-19T22:35:47.31
IV.NARO.HHN. ML:2.2 0.00017749999999999998 0.6 AML other m 2023-09-19T22:35:49.00
IV.PIEI.HHN. ML:2.1 0.0001395 1.62 AML other m 2023-09-19T22:35:49.99
IV.ATVO.HHN. ML:2.6 0.0003755 0.6 AML other m 2023-09-19T22:35:51.36
IV.ATMI.HHE. ML:2.8 0.0006174999999999999 1.48 AML other m 2023-09-19T22:35:52.04
IV.PIEI.HHE. ML:2.2 0.0001865 0.46 AML other m 2023-09-19T22:35:55.04
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, 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.
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