Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 22-09-2023 and time 07:10:04 (UTC) in region 5 km E Marradi (FI)

A magnitude ML 1.5 earthquake occured in region: 5 km E Marradi (FI), on

  • 22-09-2023 07:10:04 (UTC)
  • 22-09-2023 09:10:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0800, 11.6750 at 7 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 10 756 5107
Palazzuolo sul Senio FI 11 1154 6261
Modigliana FC 13 4560 10821
Rocca San Casciano FC 14 1910 12731
Premilcuore FC 14 799 13530
Casola Valsenio RA 17 2617 16147
San Godenzo FI 18 1167 17314
Brisighella RA 18 7639 24953
Dovadola FC 18 1653 26606

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Faenza (58541 inhabitants)
31 Km S of Imola (69797 inhabitants)
33 Km W of Forlì (117913 inhabitants)
46 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
53 Km SE of Bologna (386663 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
70 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
87 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 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 1.5 2023-09-22
07:10:04		 44.08 11.6748 7 2023-09-22
07:16:05		 Sala Sismica INGV-Roma 121345271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-22 07:10:04 ± 0.08
Latitude 44.0800 ± 0.0036
Longitude 11.6748 ± 0.0050
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121345271

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 359
Semi-minor axis of confidence ellipse (meter) 255
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 142
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 24
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) 0.02338
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 121345271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-22 07:16:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CRE.HHZ. 2023-09-22T07:10:23.31 0.6 undecidable manual S 156 55.6998 50 0.27 44
IV.MOCL.EHZ. 2023-09-22T07:10:18.63 0.6 undecidable manual S 258 40.2264 50 -0.28 45
IV.PARC.HHZ. 2023-09-22T07:10:16.84 0.6 undecidable manual P 137 65.7897 50 -0.03 45
IV.RUFI.EHZ. 2023-09-22T07:10:15.39 0.6 undecidable manual S 206 29.9478 103 -0.04 48
IV.SEI.HHZ. 2023-09-22T07:10:14.11 0.6 undecidable manual S 264 25.3524 105 0.21 47
IV.CRE.HHZ. 2023-09-22T07:10:14.90 0.6 undecidable manual P 156 55.6998 50 -0.43 42
IV.VISG.HHZ. 2023-09-22T07:10:13.28 0.6 undecidable manual S 302 22.6551 107 0.28 46
IV.RINC.EHZ. 2023-09-22T07:10:13.07 0.6 undecidable manual S 194 22.1556 107 0.24 47
IV.SFI.EHZ. 2023-09-22T07:10:13.62 0.6 undecidable manual S 145 23.754 106 0.24 47
IV.MOCL.EHZ. 2023-09-22T07:10:12.64 0.6 undecidable manual P 258 40.2264 50 -0.3 45
IV.VMGN.HHZ. 2023-09-22T07:10:11.84 0.6 undecidable manual S 219 17.9709 111 0.39 46
IV.BOSL.HHE. 2023-09-22T07:10:10.91 0.1 undecidable manual P 236 29.1486 103 0.13 95
IV.RUFI.EHZ. 2023-09-22T07:10:10.69 0.3 undecidable manual P 206 29.9478 103 -0.24 69
IT.MOG.HNN. 2023-09-22T07:10:10.15 0.6 undecidable manual S 36 12.3765 119 0.44 46
IV.SFI.EHZ. 2023-09-22T07:10:09.71 0.1 negative manual P 145 23.754 106 -0.03 98
IV.SEI.HHZ. 2023-09-22T07:10:09.87 0.1 positive manual P 264 25.3524 105 -0.18 95
IV.VISG.HHZ. 2023-09-22T07:10:09.52 1.0 undecidable manual P 302 22.6551 107 0 25
IV.RINC.EHZ. 2023-09-22T07:10:09.59 0.3 negative manual P 194 22.1556 107 0.16 72
IV.VMGN.HHZ. 2023-09-22T07:10:08.83 0.3 positive manual P 219 17.9709 111 0.2 72
IT.MOG.HNN. 2023-09-22T07:10:07.85 0.1 undecidable manual P 36 12.3765 119 0.22 96
IT.MRR.HGE. 2023-09-22T07:10:07.77 0.6 undecidable manual S 253 5.994 139 -0.17 49
IT.MRR.HGE. 2023-09-22T07:10:06.54 0.1 undecidable manual P 253 5.994 139 -0.07 100
IV.LMD.HHZ. 2023-09-22T07:10:06.77 0.6 undecidable manual S 96 2.5974 159 -0.57 45
IV.LMD.HHZ. 2023-09-22T07:10:05.96 0.1 undecidable manual P 96 2.5974 159 -0.3 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:1.4 0.000223 0.2 AML other m 2023-09-22T07:10:12.37
IV.VMGN.HHN. ML:1.4 0.00021799999999999999 0.36 AML other m 2023-09-22T07:10:12.38
IV.SFI.HNE. ML:1.6 0.000256 0.36 AML other m 2023-09-22T07:10:13.69
IV.SFI.EHE. ML:1.6 0.000228 0.36 AML other m 2023-09-22T07:10:13.88
IV.SFI.HNN. ML:1.6 0.0002505 1.02 AML other m 2023-09-22T07:10:13.94
IV.SFI.EHN. ML:1.5 0.0002105 1.72 AML other m 2023-09-22T07:10:13.95
IV.VISG.HHN. ML:1.2 0.0001095 0.46 AML other m 2023-09-22T07:10:14.36
IV.SEI.HHE. ML:1.8 0.000375 0.28 AML other m 2023-09-22T07:10:14.43
IV.SEI.HHN. ML:2.2 0.0010195 0.26 AML other m 2023-09-22T07:10:14.46
IV.RUFI.EHE. ML:1.0 0.00004315 0.74 AML other m 2023-09-22T07:10:15.36
IV.RUFI.EHN. ML:1.5 0.0001725 0.32 AML other m 2023-09-22T07:10:15.58
IV.VISG.HHE. ML:1.0 0.00006565 0.3 AML other m 2023-09-22T07:10:16.16
IV.MOCL.EHE. ML:1.4 0.0000872 0.2 AML other m 2023-09-22T07:10:18.99
IV.MOCL.EHN. ML:1.5 0.00011360000000000001 0.14 AML other m 2023-09-22T07:10:19.29
IV.CRE.HHN. ML:2.0 0.00023 0.2 AML other m 2023-09-22T07:10:23.74
IV.CRE.HHE. ML:1.9 0.0001915 0.2 AML other m 2023-09-22T07:10:23.75
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