Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 15-09-2023 and time 13:36:47 (Italy) in region 8 km S Firenzuola (FI)

A magnitude ML 0.9 earthquake occured in region: 8 km S Firenzuola (FI), on

  • 15-09-2023 11:36:47 (UTC)
  • 15-09-2023 13:36:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0480, 11.3760 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
Firenzuola FI 8 4726 4726
Borgo San Lorenzo FI 10 18211 22937
Scarperia e San Piero FI 10 12217 35154
Barberino di Mugello FI 12 10836 45990
Vicchio FI 15 8044 54034
Palazzuolo sul Senio FI 16 1154 55188
Vaglia FI 17 5073 60261
Vernio PO 18 6060 66321
Marradi FI 19 3139 69460
Monghidoro BO 20 3749 73209

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NE of Prato (191150 inhabitants)
32 Km NE of Firenze (382808 inhabitants)
36 Km NE of Scandicci (50609 inhabitants)
39 Km E of Pistoia (90315 inhabitants)
44 Km SW of Imola (69797 inhabitants)
48 Km SW of Faenza (58541 inhabitants)
50 Km S of Bologna (386663 inhabitants)
57 Km W of Forlì (117913 inhabitants)
70 Km W of Cesena (96758 inhabitants)
74 Km E of Lucca (89046 inhabitants)
76 Km SE of Modena (184973 inhabitants)
76 Km NW of Arezzo (99543 inhabitants)
78 Km SW of Ravenna (159116 inhabitants)
81 Km N of Siena (53903 inhabitants)
86 Km E of Pisa (89158 inhabitants)
90 Km S of Ferrara (133155 inhabitants)
91 Km SE of Carpi (70699 inhabitants)
92 Km E of Viareggio (62467 inhabitants)
94 Km SE of Reggio nell'Emilia (171345 inhabitants)
95 Km W of Rimini (147750 inhabitants)
99 Km E of Massa (69479 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 0.9 2023-09-15
11:36:47		 44.0477 11.376 7 2023-09-15
11:41:40		 Sala Sismica INGV-Roma 121076101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-15 11:36:47 ± 0.12
Latitude 44.0477 ± 0.0045
Longitude 11.3760 ± 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 121076101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 578
Semi-minor axis of confidence ellipse (meter) 77
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 580.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38041
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 121076101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-15 11:41:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.GSCL.HHZ. 2023-09-15T11:37:10.74 3.0 undecidable manual S 0.05 0
IV.CRMI.HHZ. 2023-09-15T11:36:55.53 0.3 undecidable manual P 229 42.2244 50 -0.3 91
IV.VMGN.HHZ. 2023-09-15T11:36:54.00 0.3 undecidable manual S 130 16.2726 114 0.42 93
IV.MOCL.EHZ. 2023-09-15T11:36:53.83 0.3 undecidable manual S 253 16.2726 114 0.23 96
IV.MTRZ.HNZ. 2023-09-15T11:36:53.90 0.3 undecidable manual P 8 29.6481 104 0.37 92
IV.VISG.HHZ. 2023-09-15T11:36:53.85 0.3 undecidable manual S 16 16.3725 114 0.23 96
IV.RUFI.EHZ. 2023-09-15T11:36:52.49 0.3 undecidable manual P 155 25.5522 106 -0.25 95
IV.BOSL.HHZ. 2023-09-15T11:36:52.94 0.3 undecidable manual S 181 12.9759 119 0.38 94
IV.FNVD.HHZ. 2023-09-15T11:36:52.51 0.3 undecidable manual P 304 24.1536 107 0.05 99
IV.MPPT.EHZ. 2023-09-15T11:36:52.62 0.3 undecidable manual P 246 24.8529 106 0.01 99
IV.RINC.EHZ. 2023-09-15T11:36:52.37 0.3 undecidable manual P 134 25.6521 106 -0.39 92
IV.MOCL.EHZ. 2023-09-15T11:36:51.04 0.3 undecidable manual P 253 16.2726 114 0.06 100
IV.VMGN.HHZ. 2023-09-15T11:36:50.74 0.3 undecidable manual P 130 16.2726 114 -0.23 96
IV.VISG.HHZ. 2023-09-15T11:36:50.92 0.3 undecidable manual P 16 16.3725 114 -0.07 100
IV.BOSL.HHZ. 2023-09-15T11:36:50.60 0.3 undecidable manual P 181 12.9759 119 0.22 97
IV.SEI.HHZ. 2023-09-15T11:36:49.52 0.3 undecidable manual S 298 1.5984 168 -0.47 94
IV.SEI.HHZ. 2023-09-15T11:36:48.63 0.3 undecidable manual P 298 1.5984 168 -0.27 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BOSL.HHE. ML:0.9 0.00008979999999999999 1.76 AML other m 2023-09-15T11:36:52.08
IV.BOSL.HHN. ML:0.7 0.00006395000000000001 0.16 AML other m 2023-09-15T11:36:53.65
IV.MOCL.EHE. ML:0.0 0.00016399999999999997 1.66 AML other m 2023-09-15T11:36:54.91
IV.VISG.HHN. ML:1.4 0.000261 0.14 AML other m 2023-09-15T11:36:54.44
IV.VISG.HHE. ML:1.3 0.00021200000000000003 0.28 AML other m 2023-09-15T11:36:54.47
IV.MOCL.EHN. ML:0.0 0.000221 0.38 AML other m 2023-09-15T11:36:54.52
IV.VMGN.HHN. ML:0.6 0.00003935 0.34 AML other m 2023-09-15T11:36:55.28
IV.VMGN.HHE. ML:0.6 0.000039599999999999994 1.1 AML other m 2023-09-15T11:36:55.57
IV.MPPT.EHE. ML:0.9 0.00004765 1.18 AML other m 2023-09-15T11:36:57.17
IV.FNVD.HHE. ML:1.0 0.00006984999999999999 0.38 AML other m 2023-09-15T11:36:57.78
IV.MPPT.EHN. ML:0.9 0.00005095 1.42 AML other m 2023-09-15T11:36:57.07
IV.FNVD.HHN. ML:0.6 0.0000258 1.32 AML other m 2023-09-15T11:36:58.05
IV.CRMI.HHE. ML:0.7 0.000013549999999999999 1.34 AML other m 2023-09-15T11:37:05.67
IV.CRMI.HHN. ML:0.9 0.000023899999999999998 0.88 AML other m 2023-09-15T11:37:06.55
IV.SEI.HHE. ML:0.0 0.00174039165 0.2176 AML other m 2023-09-15T11:36:50.07
IV.SEI.HHN. ML:0.0 0.0049172805 0.2432 AML other m 2023-09-15T11:36:49.70
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