Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 19-09-2023 and time 17:19:31 (Italy) in region 4 km W Tredozio (FC)

A magnitude ML 0.5 earthquake occured in region: 4 km W Tredozio (FC), on

  • 19-09-2023 15:19:31 (UTC)
  • 19-09-2023 17:19:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0710, 11.6960 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
Tredozio FC 4 1212 1212
Marradi FI 7 3139 4351
Portico e San Benedetto FC 9 756 5107
Rocca San Casciano FC 12 1910 7017
Modigliana FC 12 4560 11577
Premilcuore FC 12 799 12376
Palazzuolo sul Senio FI 13 1154 13530
Dovadola FC 16 1653 15183
San Godenzo FI 17 1167 16350
Brisighella RA 18 7639 23989
Casola Valsenio RA 18 2617 26606
Galeata FC 19 2516 29122

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
32 Km SW of Forlì (117913 inhabitants)
44 Km W of Cesena (96758 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
52 Km E of Prato (191150 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km SE of Bologna (386663 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
70 Km W of Rimini (147750 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
89 Km SE of Modena (184973 inhabitants)
89 Km NE of Siena (53903 inhabitants)
99 Km E of Lucca (89046 inhabitants)
99 Km W of Pesaro (94582 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 0.5 2023-09-19
15:19:31		 44.0712 11.696 7 2023-09-19
15:33:34		 Sala Sismica INGV-Roma 121234711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-19 15:19:31 ± 0.15
Latitude 44.0712 ± 0.0045
Longitude 11.6960 ± 0.0075
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 121234711

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 640
Semi-minor axis of confidence ellipse (meter) 165
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 106
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.48833
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 121234711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-19 15:33:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SERS.HHZ. 2023-09-19T15:21:03.23 3.0 undecidable manual Pn 2.03 0
IV.GIUL.HHZ. 2023-09-19T15:20:45.07 3.0 undecidable manual Sn -1.58 0
OX.CIMO.HHZ. 2023-09-19T15:20:43.12 3.0 undecidable manual Sg 0.46 0
IV.FAGN.HHZ. 2023-09-19T15:20:33.44 3.0 undecidable manual Sn -1.3 0
IT.LRNO.HNZ. 2023-09-19T15:20:20.69 3.0 undecidable manual Pn 0.57 0
IV.FIAM.HHZ. 2023-09-19T15:20:04.11 3.0 negative manual Pn 0.5 0
IV.CING.HHZ. 2023-09-19T15:19:50.99 3.0 undecidable manual P -2.08 0
IV.RIBO.EHZ.01 2023-09-19T15:19:50.08 3.0 undecidable manual P -2.72 0
IV.FOSV.EHZ. 2023-09-19T15:19:48.62 3.0 negative manual P -0.63 0
IV.RUFI.EHE. 2023-09-19T15:19:42.42 0.3 undecidable manual S 210 29.8479 104 -0.06 73
IV.CRE.HHZ. 2023-09-19T15:19:41.76 0.6 undecidable manual P 158 54.2013 50 -0.32 44
IV.SEI.HHZ. 2023-09-19T15:19:41.29 0.3 undecidable manual S 266 26.9508 105 -0.22 71
IV.VISG.HHZ. 2023-09-19T15:19:40.97 0.3 undecidable manual S 302 24.5532 106 0.25 70
IV.RINC.EHZ. 2023-09-19T15:19:40.02 0.3 undecidable manual S 199 21.6672 108 0.27 71
IV.VMGN.HHZ. 2023-09-19T15:19:39.18 0.3 undecidable manual S 225 18.3705 111 0.51 67
IV.RSM2.HHZ. 2023-09-19T15:19:38.96 3.0 negative manual P -0.95 0
IV.SEI.HHZ. 2023-09-19T15:19:37.11 0.1 undecidable manual P 266 26.9508 105 -0.3 93
IT.MOG.HNE. 2023-09-19T15:19:37.51 0.6 undecidable manual S 27 12.3765 120 0.73 42
IV.RUFI.EHE. 2023-09-19T15:19:37.72 0.3 undecidable manual P 210 29.8479 104 -0.25 70
IV.VISG.HHZ. 2023-09-19T15:19:36.90 0.1 undecidable manual P 302 24.5532 106 -0.06 98
IV.RINC.EHZ. 2023-09-19T15:19:36.48 0.1 undecidable manual P 199 21.6672 108 0.08 98
IT.MRR.HGZ. 2023-09-19T15:19:35.26 0.3 undecidable manual S 264 7.3815 134 -0.16 74
IV.VMGN.HHZ. 2023-09-19T15:19:35.94 0.1 undecidable manual P 225 18.3705 111 0.17 97
IT.MOG.HNE. 2023-09-19T15:19:34.73 0.3 undecidable manual P 27 12.3765 120 0.04 75
IV.LMD.HHZ. 2023-09-19T15:19:33.86 0.6 undecidable manual S 52 1.0989 171 -0.5 46
IT.MRR.HGZ. 2023-09-19T15:19:33.99 0.1 undecidable manual P 264 7.3815 134 0.09 100
IV.LMD.HHZ. 2023-09-19T15:19:33.10 0.1 undecidable manual P 52 1.0989 171 -0.18 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:0.0 0.0005604705500000001 0.1408 AML other m 2023-09-19T15:19:34.12
IV.SEI.HHE. ML:1.1 0.00007280000000000001 0.32 AML other m 2023-09-19T15:19:41.60
IV.SEI.HHN. ML:1.3 0.00011899999999999999 0.36 AML other m 2023-09-19T15:19:43.50
IV.VMGN.HHE. ML:0.2 0.0000172993785 0.1664 AML other m 2023-09-19T15:19:40.48
IV.VMGN.HHN. ML:0.4 0.000020141616 0.32 AML other m 2023-09-19T15:19:40.58
IV.VISG.HHE. ML:0.2 0.000012491265000000001 0.1408 AML other m 2023-09-19T15:19:41.41
IV.VISG.HHN. ML:0.4 0.0000149594495 0.1408 AML other m 2023-09-19T15:19:41.07
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