Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 09-04-2021 and time 18:20:23 (Italy) in region 3 km N Firenzuola (FI)

A magnitude ML 1.7 earthquake occured in region: 3 km N Firenzuola (FI), on

  • 09-04-2021 16:20:23 (UTC)
  • 09-04-2021 18:20:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1460, 11.3860 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 3 4726 4726
Monghidoro BO 10 3749 8475
Castel del Rio BO 12 1246 9721
Palazzuolo sul Senio FI 14 1154 10875
San Benedetto Val di Sambro BO 14 4315 15190
Loiano BO 15 4294 19484
Monzuno BO 17 6328 25812
Castiglione dei Pepoli BO 18 5648 31460
Fontanelice BO 19 1943 33403
Marradi FI 20 3139 36542
Barberino di Mugello FI 20 10836 47378
Monterenzio BO 20 6035 53413

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Imola (69797 inhabitants)
37 Km NE of Prato (191150 inhabitants)
39 Km S of Bologna (386663 inhabitants)
43 Km W of Faenza (58541 inhabitants)
43 Km N of Firenze (382808 inhabitants)
44 Km NE of Pistoia (90315 inhabitants)
46 Km NE of Scandicci (50609 inhabitants)
53 Km W of Forlì (117913 inhabitants)
67 Km SE of Modena (184973 inhabitants)
68 Km W of Cesena (96758 inhabitants)
72 Km W of Ravenna (159116 inhabitants)
78 Km E of Lucca (89046 inhabitants)
79 Km S of Ferrara (133155 inhabitants)
81 Km SE of Carpi (70699 inhabitants)
85 Km NW of Arezzo (99543 inhabitants)
86 Km SE of Reggio nell'Emilia (171345 inhabitants)
92 Km NE of Pisa (89158 inhabitants)
92 Km N of Siena (53903 inhabitants)
95 Km W of Rimini (147750 inhabitants)
96 Km E of Viareggio (62467 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
Bulletin
Rev1000 		ML 1.7 2021-04-09
16:20:23		 44.1465 11.3858 9 2021-07-12
16:55:13		 Bollettino Sismico Italiano INGV 90721721
Reviewed
Rev100 		ML 1.6 2021-04-09
16:20:23		 44.1487 11.3873 9 2021-04-09
16:27:03		 Sala Sismica INGV-Roma 88945191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-09 16:20:23 ± 0.08
Latitude 44.1465 ± 0.0045
Longitude 11.3858 ± 0.0063
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90721721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 473
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 312
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 30
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.05486
Epicentral distance of station farthest from the epicenter (degree) 0.75093
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 90721721
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-02 13:03:30

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 88945191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-09 16:27:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASQU.HHZ. 2021-04-09T16:20:39.80 0.3 undecidable manual S 140 50.4162 50 0.23 68
IV.PII.HHZ. 2021-04-09T16:20:38.24 0.6 undecidable manual P 236 83.3499 50 0.5 40
IV.SFI.EHZ. 2021-04-09T16:20:38.50 0.3 undecidable manual S 126 45.5211 50 0.24 68
IV.CRE.HHZ. 2021-04-09T16:20:36.57 0.6 undecidable manual P 142 73.9704 50 0.28 43
IV.RUFI.EHZ. 2021-04-09T16:20:35.30 0.3 undecidable manual S 164 35.6421 50 -0.31 69
IV.RINC.HHZ. 2021-04-09T16:20:35.00 0.3 undecidable manual S 148 33.8439 50 -0.13 71
IV.MPPT.EHZ. 2021-04-09T16:20:34.40 0.3 undecidable manual S 228 31.5462 50 -0.13 72
IV.BRIS.HHZ. 2021-04-09T16:20:34.90 0.3 undecidable manual S 74 31.5462 50 0.38 68
IV.LMD.HHZ. 2021-04-09T16:20:33.30 0.6 undecidable manual S 107 26.751 109 0.25 47
IV.ASQU.HHZ. 2021-04-09T16:20:32.33 0.3 undecidable manual P 140 50.4162 50 -0.34 66
IV.MOCL.EHZ. 2021-04-09T16:20:31.80 0.3 undecidable manual S 226 22.6551 112 0.07 74
IV.IMOL.EHZ. 2021-04-09T16:20:31.25 0.3 undecidable manual P 50 36.9297 50 0.67 61
IV.MTRZ.HHZ. 2021-04-09T16:20:31.00 0.3 undecidable manual S 10 18.6702 116 0.52 67
IV.ZCCA.HHZ. 2021-04-09T16:20:31.39 0.6 undecidable manual P 305 39.627 50 0.39 45
IV.FNVD.HHZ. 2021-04-09T16:20:31.10 0.3 undecidable manual S 277 21.0678 114 -0.11 73
IV.SFI.EHZ. 2021-04-09T16:20:31.42 0.3 undecidable manual P 126 45.5211 50 -0.49 65
IV.RONT.HHZ. 2021-04-09T16:20:30.47 0.3 undecidable manual S 168 17.3715 118 0.4 69
IV.BRIS.HHZ. 2021-04-09T16:20:29.63 0.3 undecidable manual P 74 31.5462 50 -0.12 72
IV.RUFI.EHZ. 2021-04-09T16:20:29.52 0.6 undecidable manual P 164 35.6421 50 -0.86 38
IV.MPPT.EHZ. 2021-04-09T16:20:29.54 1.0 undecidable manual P 228 31.5462 50 -0.22 23
IV.RINC.HHZ. 2021-04-09T16:20:29.91 0.3 undecidable manual P 148 33.8439 50 -0.2 70
IV.LMD.HHZ. 2021-04-09T16:20:28.23 0.3 undecidable manual P 107 26.751 109 -0.67 62
IV.MOCL.EHZ. 2021-04-09T16:20:28.12 0.1 undecidable manual P 226 22.6551 112 -0.02 99
IV.SEI.HHZ. 2021-04-09T16:20:28.50 0.3 undecidable manual S 192 10.4784 131 0.42 70
IV.RONT.HHZ. 2021-04-09T16:20:27.41 0.3 undecidable manual P 168 17.3715 118 0.23 72
IV.MTRZ.HHZ. 2021-04-09T16:20:27.40 0.1 undecidable manual P 10 18.6702 116 -0.02 100
IV.FNVD.HHZ. 2021-04-09T16:20:27.66 0.1 undecidable manual P 277 21.0678 114 -0.18 96
IV.SEI.HHZ. 2021-04-09T16:20:26.31 0.3 undecidable manual P 192 10.4784 131 0.28 72
IV.VISG.HHZ. 2021-04-09T16:20:26.52 0.3 undecidable manual S 39 6.0939 147 -0.55 68
IV.VISG.HHZ. 2021-04-09T16:20:25.11 0.1 undecidable manual P 39 6.0939 147 -0.34 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHN. ML:2.5 0.00396 1.62 AML other m 2021-04-09T16:20:28.12
IV.SEI.HHE. ML:2.5 0.00429 1.68 AML other m 2021-04-09T16:20:29.96
IV.SFI.HNN. ML:1.2 0.000047682629 1.0208 AML other m 2021-04-09T16:20:31.28
IV.MOCL.EHE. ML:1.7 0.00036602225 0.1408 AML other m 2021-04-09T16:20:32.43
IV.MOCL.EHN. ML:1.6 0.0002564711 0.1408 AML other m 2021-04-09T16:20:32.38
IV.MTRZ.HHN. ML:1.9 0.0006125000000000001 0.4 AML other m 2021-04-09T16:20:33.20
IV.MTRZ.HNN. ML:1.9 0.0006294739000000001 1.5776 AML other m 2021-04-09T16:20:33.20
IV.LMD.HHN. ML:1.5 0.00019 0.12 AML other m 2021-04-09T16:20:33.96
IV.BRIS.HNE. ML:1.4 0.000125470455 0.7168 AML other m 2021-04-09T16:20:34.47
IV.MPPT.EHN. ML:1.4 0.000117 0.18 AML other m 2021-04-09T16:20:35.04
IV.LMD.HHE. ML:1.5 0.00017127 1.8208 AML other m 2021-04-09T16:20:35.97
IV.BRIS.HHN. ML:2.0 0.0004964133 0.2304 AML other m 2021-04-09T16:20:35.30
IV.RINC.HHE. ML:2.0 0.00043599999999999997 0.22 AML other m 2021-04-09T16:20:35.36
IV.RINC.HHN. ML:1.9 0.0003447344 0.2176 AML other m 2021-04-09T16:20:35.44
IV.RUFI.EHE. ML:1.7 0.0002155 0.24 AML other m 2021-04-09T16:20:35.73
IV.MTRZ.HHE. ML:1.9 0.0006665000000000001 1.44 AML other m 2021-04-09T16:20:35.90
IV.MTRZ.HNE. ML:1.9 0.000622 1.42 AML other m 2021-04-09T16:20:35.91
IV.RUFI.EHN. ML:1.3 0.000085001825 0.3328 AML other m 2021-04-09T16:20:36.68
IV.MPPT.EHE. ML:1.3 0.00008894574 0.6528 AML other m 2021-04-09T16:20:36.47
IV.BRIS.HNN. ML:1.8 0.00025810365000000004 0.8224 AML other m 2021-04-09T16:20:38.05
IV.SFI.EHN. ML:1.4 0.00007885 0.92 AML other m 2021-04-09T16:20:39.12
IV.SFI.EHE. ML:1.5 0.00009190414500000001 0.1664 AML other m 2021-04-09T16:20:40.20
IV.ASQU.HHE. ML:1.8 0.0001565 0.24 AML other m 2021-04-09T16:20:40.35
IV.ASQU.HHN. ML:1.8 0.00014267930000000001 0.2048 AML other m 2021-04-09T16:20:40.35
IV.SFI.HNE. ML:1.5 0.00009594524000000001 0.2944 AML other m 2021-04-09T16:20:40.41
IV.BRIS.HHE. ML:1.9 0.0003695 1.62 AML other m 2021-04-09T16:20:43.03
IV.PII.HHE. ML:1.8 0.000078384865 0.32 AML other m 2021-04-09T16:20:49.04
IV.CRE.HHE. ML:1.2 0.00002494797 0.4992 AML other m 2021-04-09T16:20:50.60
IV.PII.HHN. ML:1.6 0.00005592188000000001 0.2816 AML other m 2021-04-09T16:20:51.84
IV.CRE.HHN. ML:1.5 0.000043455164999999994 1.7056 AML other m 2021-04-09T16:20:56.89
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