Earthquake with magnitude of ML 0.5 on date 18-09-2023 and time 17:39:34 (UTC) in region 6 km SE Marradi (FI)

A magnitude ML 0.5 earthquake occured in region: 6 km SE Marradi (FI), on

  • 18-09-2023 17:39:34 (UTC)
  • 18-09-2023 19:39:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0470, 11.6800 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.

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 6 3139 3139
Tredozio FC 6 1212 4351
Portico e San Benedetto FC 8 756 5107
Premilcuore FC 11 799 5906
Palazzuolo sul Senio FI 13 1154 7060
Rocca San Casciano FC 13 1910 8970
San Godenzo FI 14 1167 10137
Modigliana FC 15 4560 14697
Dovadola FC 19 1653 16350
Galeata FC 19 2516 18866

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Faenza (58541 inhabitants)
34 Km S of Imola (69797 inhabitants)
35 Km SW of Forlì (117913 inhabitants)
46 Km NE of Firenze (382808 inhabitants)
46 Km W of Cesena (96758 inhabitants)
50 Km E of Prato (191150 inhabitants)
51 Km NE of Scandicci (50609 inhabitants)
57 Km SE of Bologna (386663 inhabitants)
59 Km SW of Ravenna (159116 inhabitants)
62 Km E of Pistoia (90315 inhabitants)
66 Km N of Arezzo (99543 inhabitants)
71 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)
97 Km E of Lucca (89046 inhabitants)
100 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 2023-09-18
17:39:34
44.0467 11.6802 8 2023-09-18
17:45:30
Sala Sismica INGV-Roma 121200621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-18 17:39:34 ± 0.11
Latitude 44.0467 ± 0.0027
Longitude 11.6802 ± 0.0038
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 121200621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 377
Semi-minor axis of confidence ellipse (meter) 162
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 126
Circular confidence region, given by single value of horizontal uncertainty (meter) 380.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.03687
Epicentral distance of station farthest from the epicenter (degree) 0.24821
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.0
Num. used stations 4
Type of magnitude ML
Reference to an origin 121200621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-18 17:45:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BOSL.HHZ. 2023-09-18T17:39:43.96 0.6 undecidable manual S 242 27.5502 106 -0.09 48
IV.RINC.EHZ. 2023-09-18T17:39:41.19 0.6 undecidable manual S 198 18.6702 113 0.05 49
IV.SFI.EHZ. 2023-09-18T17:39:41.72 0.6 undecidable manual S 140 20.6682 111 -0.04 49
IV.VMGN.HHZ. 2023-09-18T17:39:40.49 0.6 undecidable manual S 229 15.5733 117 0.33 47
IT.MOG.HNE. 2023-09-18T17:39:40.31 0.3 undecidable manual S 27 15.3735 117 0.22 72
IV.SEI.HHZ. 2023-09-18T17:39:39.27 0.1 undecidable manual P 272 25.6521 107 -0.2 95
IV.BOSL.HHZ. 2023-09-18T17:39:39.71 0.1 undecidable manual P 242 27.5502 106 -0.13 96
IV.RUFI.EHZ. 2023-09-18T17:39:39.57 0.3 positive manual P 211 26.8509 107 -0.13 72
IV.RINC.EHZ. 2023-09-18T17:39:38.32 0.6 positive manual P 198 18.6702 113 0.16 48
IV.SFI.EHZ. 2023-09-18T17:39:38.47 0.1 undecidable manual P 140 20.6682 111 -0.05 98
IV.VMGN.HHZ. 2023-09-18T17:39:37.87 0.3 positive manual P 229 15.5733 117 0.28 71
IT.MOG.HNE. 2023-09-18T17:39:37.62 0.1 undecidable manual P 27 15.3735 117 0.06 99
IT.MRR.HGE. 2023-09-18T17:39:37.60 0.6 undecidable manual S 288 6.3936 141 -0.04 51
IV.LMD.HHZ. 2023-09-18T17:39:36.91 0.6 undecidable manual S 32 4.0959 153 -0.28 48
IT.MRR.HGE. 2023-09-18T17:39:36.26 0.1 undecidable manual P 288 6.3936 141 0.12 99
IV.LMD.HHZ. 2023-09-18T17:39:35.77 0.1 undecidable manual P 32 4.0959 153 -0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHN. ML:0.6 0.00003275 1.1 AML other m 2023-09-18T17:39:41.37
IV.VMGN.HHE. ML:0.5 0.000031849999999999995 0.92 AML other m 2023-09-18T17:39:41.47
IV.SFI.EHE. ML:0.5 0.000022735 0.48 AML other m 2023-09-18T17:39:43.34
IV.SFI.EHN. ML:0.5 0.0000258 1.2 AML other m 2023-09-18T17:39:43.85
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