Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-09-2023 and time 01:10:28 (UTC) in region 4 km W Tredozio (FC)

A magnitude ML 1.4 earthquake occured in region: 4 km W Tredozio (FC), on

  • 21-09-2023 01:10:28 (UTC)
  • 21-09-2023 03:10:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0800, 11.7010 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
Tredozio FC 4 1212 1212
Marradi FI 7 3139 4351
Portico e San Benedetto FC 9 756 5107
Modigliana FC 11 4560 9667
Rocca San Casciano FC 12 1910 11577
Palazzuolo sul Senio FI 13 1154 12731
Premilcuore FC 13 799 13530
Dovadola FC 16 1653 15183
Brisighella RA 17 7639 22822
Casola Valsenio RA 17 2617 25439
San Godenzo FI 18 1167 26606
Galeata FC 19 2516 29122

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km SW of Faenza (58541 inhabitants)
31 Km S of Imola (69797 inhabitants)
32 Km SW of Forlì (117913 inhabitants)
44 Km W of Cesena (96758 inhabitants)
50 Km NE of Firenze (382808 inhabitants)
53 Km E of Prato (191150 inhabitants)
54 Km SE of Bologna (386663 inhabitants)
55 Km SW of Ravenna (159116 inhabitants)
55 Km NE of Scandicci (50609 inhabitants)
65 Km E of Pistoia (90315 inhabitants)
69 Km W of Rimini (147750 inhabitants)
70 Km N of Arezzo (99543 inhabitants)
84 Km S of Ferrara (133155 inhabitants)
88 Km SE of Modena (184973 inhabitants)
90 Km NE of Siena (53903 inhabitants)
99 Km W of Pesaro (94582 inhabitants)
99 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 1.4 2023-09-21
01:10:28		 44.0802 11.7007 9 2023-09-21
09:23:50		 Sala Sismica INGV-Roma 121306671
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 01:10:28 ± 0.1
Latitude 44.0802 ± 0.0054
Longitude 11.7007 ± 0.0063
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121306671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 597
Semi-minor axis of confidence ellipse (meter) 241
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 31
Circular confidence region, given by single value of horizontal uncertainty (meter) 600.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49553
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 121306671
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 09:23:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZCCA.HNZ. 2023-09-21T01:10:48.36 3.0 undecidable manual S -0.44 0
IV.CRE.HHZ. 2023-09-21T01:10:46.26 0.3 undecidable manual S 158 55.0005 50 0.34 66
IV.MOCL.EHZ. 2023-09-21T01:10:42.68 0.3 undecidable manual S 259 42.3243 50 0.14 70
IV.BOSL.HHZ. 2023-09-21T01:10:39.69 0.1 undecidable manual S 238 30.8469 50 0.21 94
IV.SEI.HHZ. 2023-09-21T01:10:38.56 0.3 undecidable manual S 264 27.4503 109 0.15 72
IV.CRE.HHZ. 2023-09-21T01:10:38.38 0.1 undecidable manual P 158 55.0005 50 -0.13 92
IV.VISG.HHZ. 2023-09-21T01:10:37.78 0.3 undecidable manual S 300 24.3534 111 0.36 69
IV.SFI.EHZ. 2023-09-21T01:10:37.23 0.3 undecidable manual S 149 22.6551 112 0.36 69
IV.MTRZ.HHZ. 2023-09-21T01:10:37.49 3.0 undecidable manual P 0
IV.MOCL.EHZ. 2023-09-21T01:10:36.54 0.1 undecidable manual P 259 42.3243 50 -0.01 96
IV.IMOL.EHZ. 2023-09-21T01:10:36.22 3.0 undecidable manual P 0
IV.VMGN.HHZ. 2023-09-21T01:10:35.99 0.3 undecidable manual S 224 19.3695 115 0.19 72
IV.BOSL.HHZ. 2023-09-21T01:10:34.58 0.1 undecidable manual P 238 30.8469 50 -0.21 94
IV.RUFI.EHZ. 2023-09-21T01:10:34.50 0.1 undecidable manual P 210 30.8469 50 -0.3 92
IV.VISG.HHZ. 2023-09-21T01:10:33.57 0.1 undecidable manual P 300 24.3534 111 -0.03 99
IV.SFI.EHZ. 2023-09-21T01:10:33.11 0.1 undecidable manual P 149 22.6551 112 -0.17 96
IV.SEI.HHZ. 2023-09-21T01:10:33.84 0.1 undecidable manual P 264 27.4503 109 -0.33 92
IV.RINC.EHZ. 2023-09-21T01:10:33.19 0.1 undecidable manual P 199 22.755 112 -0.1 97
IV.VMGN.HHZ. 2023-09-21T01:10:32.67 0.1 undecidable manual P 224 19.3695 115 0 100
IT.MOG.HNE. 2023-09-21T01:10:31.50 0.1 undecidable manual P 28 11.2776 129 0.2 97
IT.MRR.HGN. 2023-09-21T01:10:30.54 0.1 undecidable manual P 257 7.9809 139 -0.27 96
IV.LMD.HHZ. 2023-09-21T01:10:29.48 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:1.1 0.00008854999999999998 0.44 AML other m 2023-09-21T01:10:36.96
IV.SFI.EHN. ML:1.5 0.0002145 0.12 AML other m 2023-09-21T01:10:38.10
IV.RINC.EHE. ML:1.4 0.0001715 1.28 AML other m 2023-09-21T01:10:38.80
IV.SEI.HHE. ML:1.7 0.000273 0.38 AML other m 2023-09-21T01:10:39.32
IV.VISG.HHE. ML:1.0 0.000054099999999999994 1.5 AML other m 2023-09-21T01:10:39.05
IV.SFI.EHE. ML:1.4 0.000177 0.78 AML other m 2023-09-21T01:10:40.59
IV.VMGN.HHN. ML:1.1 0.0000902 1.26 AML other m 2023-09-21T01:10:40.31
IV.VISG.HHN. ML:1.0 0.0000649 0.68 AML other m 2023-09-21T01:10:41.08
IV.BOSL.HHN. ML:0.9 0.000033600000000000004 0.38 AML other m 2023-09-21T01:10:41.73
IV.BOSL.HHE. ML:0.7 0.000025750000000000002 1 AML other m 2023-09-21T01:10:41.73
IV.RINC.EHN. ML:1.5 0.00022 1.42 AML other m 2023-09-21T01:10:42.12
IV.SEI.HHN. ML:2.0 0.000585 0.38 AML other m 2023-09-21T01:10:42.87
IV.MOCL.EHN. ML:1.7 0.0001645 0.2 AML other m 2023-09-21T01:10:43.49
IV.MOCL.EHE. ML:1.5 0.00010059999999999999 0.3 AML other m 2023-09-21T01:10:44.29
IV.CRE.HHN. ML:1.8 0.000144 0.2 AML other m 2023-09-21T01:10:47.48
IV.CRE.HHE. ML:1.5 0.00007825 1.8 AML other m 2023-09-21T01:10:47.03
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