Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 18-09-2023 and time 18:03:31 (UTC) in region 5 km SW Tredozio (FC)

A magnitude ML 1.3 earthquake occured in region: 5 km SW Tredozio (FC), on

  • 18-09-2023 18:03:31 (UTC)
  • 18-09-2023 20:03:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0500, 11.6960 at 8 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 5 1212 1212
Marradi FI 7 3139 4351
Portico e San Benedetto FC 7 756 5107
Premilcuore FC 10 799 5906
Rocca San Casciano FC 12 1910 7816
Palazzuolo sul Senio FI 14 1154 8970
Modigliana FC 14 4560 13530
San Godenzo FI 15 1167 14697
Dovadola FC 17 1653 16350
Galeata FC 18 2516 18866
Brisighella RA 20 7639 26505

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Faenza (58541 inhabitants)
34 Km SW of Forlì (117913 inhabitants)
34 Km S of Imola (69797 inhabitants)
45 Km W of Cesena (96758 inhabitants)
47 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
52 Km NE of Scandicci (50609 inhabitants)
57 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
67 Km N of Arezzo (99543 inhabitants)
70 Km W of Rimini (147750 inhabitants)
86 Km NE of Siena (53903 inhabitants)
88 Km S of Ferrara (133155 inhabitants)
90 Km SE of Modena (184973 inhabitants)
98 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 1.3 2023-09-18
18:03:31		 44.0498 11.6963 8 2023-09-18
18:16:00		 Sala Sismica INGV-Roma 121201661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 18:03:31 ± 0.11
Latitude 44.0498 ± 0.0027
Longitude 11.6963 ± 0.0050
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121201661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 370
Semi-minor axis of confidence ellipse (meter) 137
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 107
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.25990
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 121201661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 18:16:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
NI.POLC.HHZ. 2023-09-18T18:04:29.13 3.0 undecidable manual Sn -0.18 0
IV.SNTG.HHZ. 2023-09-18T18:04:12.53 3.0 undecidable manual S 0.81 0
IV.MML1.EHZ. 2023-09-18T18:04:11.59 3.0 undecidable manual S -3 0
IV.ASSB.HHZ. 2023-09-18T18:04:11.33 3.0 undecidable manual S -1.16 0
IV.ARVD.HHZ. 2023-09-18T18:04:09.23 3.0 undecidable manual S 1.24 0
IV.TOLF.HHZ. 2023-09-18T18:04:04.66 3.0 undecidable manual Pn 0.09 0
IV.PP3.EHZ. 2023-09-18T18:04:00.68 3.0 negative manual Pg 2.71 0
IV.ZEN8.EHZ. 2023-09-18T18:04:00.20 3.0 undecidable manual Pg 1.45 0
IV.VMAN.HHN. 2023-09-18T18:03:54.01 3.0 undecidable manual P -1.1 0
IV.MNTV.EHE. 2023-09-18T18:03:51.71 3.0 positive manual P -0.84 0
IV.FRON.EHZ. 2023-09-18T18:03:51.10 3.0 undecidable manual P 1.71 0
IV.SEI.HHZ. 2023-09-18T18:03:41.09 1.0 undecidable manual S 271 26.9508 106 -0.01 25
IV.RUFI.EHZ. 2023-09-18T18:03:41.25 0.3 undecidable manual S 212 27.8499 105 -0.15 72
IV.CRE.HHZ. 2023-09-18T18:03:40.90 3.0 undecidable manual P -0.52 0
IV.VMGN.HHZ. 2023-09-18T18:03:38.16 0.6 undecidable manual S 231 16.7721 115 0.37 47
IV.SFI.EHZ. 2023-09-18T18:03:38.90 0.3 undecidable manual S 143 20.0688 111 0.05 74
IV.RINC.EHZ. 2023-09-18T18:03:38.70 0.6 undecidable manual S 202 19.4694 111 0.05 49
IT.MOG.HNE. 2023-09-18T18:03:37.43 0.6 undecidable manual S 23 14.4744 118 0.35 47
IV.BOSL.HHZ. 2023-09-18T18:03:37.29 0.1 undecidable manual P 243 28.8489 105 -0.08 97
IV.RUFI.EHZ. 2023-09-18T18:03:36.99 0.1 positive manual P 212 27.8499 105 -0.18 95
IV.VISG.HHZ. 2023-09-18T18:03:36.64 0.1 undecidable manual P 307 25.9518 106 -0.17 96
IV.SEI.HHZ. 2023-09-18T18:03:36.80 0.6 negative manual P 271 26.9508 106 -0.19 47
IT.MRR.HGE. 2023-09-18T18:03:35.23 0.3 undecidable manual S 282 7.5813 135 0.1 75
IV.VMGN.HHZ. 2023-09-18T18:03:35.33 0.1 positive manual P 231 16.7721 115 0.24 96
IV.SFI.EHZ. 2023-09-18T18:03:35.65 0.1 positive manual P 143 20.0688 111 -0.05 99
IV.RINC.EHZ. 2023-09-18T18:03:35.70 0.3 positive manual P 202 19.4694 111 0.12 73
IT.MOG.HNE. 2023-09-18T18:03:34.80 0.1 undecidable manual P 23 14.4744 118 0.13 98
IT.MRR.HGE. 2023-09-18T18:03:33.65 0.1 undecidable manual P 282 7.5813 135 0.1 100
IV.LMD.HHN. 2023-09-18T18:03:33.90 0.6 undecidable manual S 16 3.1968 157 -0.37 48
IV.LMD.HHN. 2023-09-18T18:03:32.88 0.1 undecidable manual P 16 3.1968 157 -0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LMD.HHE. ML:2.3 0.003935 1.86 AML other m 2023-09-18T18:03:33.03
IV.LMD.HHN. ML:2.2 0.00275 1.86 AML other m 2023-09-18T18:03:34.99
IV.VMGN.HHN. ML:1.4 0.00022349999999999998 0.24 AML other m 2023-09-18T18:03:38.53
IV.VMGN.HHE. ML:1.3 0.00017749999999999998 0.38 AML other m 2023-09-18T18:03:38.49
IV.SFI.EHE. ML:1.2 0.000137 1.62 AML other m 2023-09-18T18:03:38.99
IV.RINC.EHN. ML:1.3 0.00017199999999999998 0.5 AML other m 2023-09-18T18:03:39.39
IV.RINC.EHE. ML:1.3 0.000146 1.04 AML other m 2023-09-18T18:03:39.44
IV.SFI.EHN. ML:1.2 0.0001215 1 AML other m 2023-09-18T18:03:39.59
IV.VISG.HHN. ML:0.9 0.000052000000000000004 0.62 AML other m 2023-09-18T18:03:41.04
IV.BOSL.HHN. ML:0.8 0.00002985 0.42 AML other m 2023-09-18T18:03:42.15
IV.VISG.HHE. ML:0.9 0.0000484 0.62 AML other m 2023-09-18T18:03:42.17
IV.BOSL.HHE. ML:0.6 0.000020749999999999996 0.3 AML other m 2023-09-18T18:03:42.49
IV.SEI.HHN. ML:1.6 0.0002305 0.32 AML other m 2023-09-18T18:03:42.74
IV.SEI.HHE. ML:1.5 0.000185 1.56 AML other m 2023-09-18T18:03:44.04
IV.CRE.HHE. ML:1.2 0.0000385 0.26 AML other m 2023-09-18T18:03:48.80
IV.CRE.HHN. ML:1.4 0.00006205 1.36 AML other m 2023-09-18T18:03:49.71
IV.ASSB.HHE. ML:1.6 0.00002695 0.5 AML other m 2023-09-18T18:04:13.98
IV.ASSB.HHN. ML:1.8 0.00003485 1.36 AML other m 2023-09-18T18:04:14.01
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