Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 08-09-2021 and time 17:07:11 (Italy) in region 5 km NW Vecchiano (PI)

A magnitude ML 1.8 earthquake occured in region: 5 km NW Vecchiano (PI), on

  • 08-09-2021 15:07:11 (UTC)
  • 08-09-2021 17:07:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8220, 10.3600 at 15 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
Vecchiano PI 5 12189 12189
Massarosa LU 5 22471 34660
San Giuliano Terme PI 9 31399 66059
Viareggio LU 10 62467 128526
Lucca LU 12 89046 217572
Pisa PI 12 89158 306730
Camaiore LU 14 32513 339243
Calci PI 17 6426 345669
Pescaglia LU 17 3526 349195
Capannori LU 18 46252 395447
Pietrasanta LU 19 24007 419454

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SE of Viareggio (62467 inhabitants)
12 Km W of Lucca (89046 inhabitants)
12 Km N of Pisa (89158 inhabitants)
30 Km SE of Massa (69479 inhabitants)
30 Km N of Livorno (159219 inhabitants)
35 Km SE of Carrara (63133 inhabitants)
47 Km W of Pistoia (90315 inhabitants)
53 Km SE of La Spezia (93959 inhabitants)
60 Km W of Prato (191150 inhabitants)
66 Km W of Scandicci (50609 inhabitants)
72 Km W of Firenze (382808 inhabitants)
96 Km NW of Siena (53903 inhabitants)
100 Km S of Reggio nell'Emilia (171345 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 1.8 2021-09-08
15:07:11		 43.8223 10.3598 15 2022-03-30
13:04:31		 Bollettino Sismico Italiano INGV 99867001
Reviewed
Rev100 		ML 1.8 2021-09-08
15:07:11		 43.8245 10.3572 10 2021-09-08
15:22:54		 Sala Sismica INGV-Roma 95200211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-08 15:07:11 ± 0.25
Latitude 43.8223 ± 0.0099
Longitude 10.3598 ± 0.0150
Depth (km) 15 ± 5 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99867001

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1197
Semi-minor axis of confidence ellipse (meter) 372
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 237
Circular confidence region, given by single value of horizontal uncertainty (meter) 1200.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 207
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37412
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 99867001
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-24 00:34:05

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 95200211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-08 15:22:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MAGA.HHZ. 2021-09-08T15:08:27.39 3.0 undecidable manual Sn -9.99 0
MN.IDI.HHZ. 2021-09-08T15:08:04.67 3.0 undecidable manual Pn -8.83 0
IV.HPAC.HHZ. 2021-09-08T15:07:46.99 3.0 undecidable manual Sn -8.03 0
IV.RAFF.HHZ. 2021-09-08T15:07:42.80 3.0 undecidable manual Sn -2.16 0
IV.BAG8.HNZ. 2021-09-08T15:07:39.38 3.0 undecidable manual Pg 8.22 0
IV.BOZZ.HNZ. 2021-09-08T15:07:38.06 3.0 positive manual Pg 14.37 0
IV.QLNO.HHZ. 2021-09-08T15:07:31.69 3.0 negative manual Pn -1.96 0
IV.CTL8.HNZ. 2021-09-08T15:07:30.99 3.0 positive manual Pn 0.69 0
IV.RESU.HHZ. 2021-09-08T15:07:28.78 3.0 undecidable manual Sn -8.01 0
IV.TOLF.HHZ. 2021-09-08T15:07:25.63 3.0 undecidable manual Sg 2.11 0
GU.POPM.HHZ. 2021-09-08T15:07:24.35 0.3 undecidable manual S 52 40.2264 98 -0.02 72
GU.EQUI.HHZ. 2021-09-08T15:07:24.16 0.3 undecidable manual S 337 41.5251 98 -0.57 65
IV.BDI.HHZ. 2021-09-08T15:07:22.22 0.6 undecidable manual S 35 32.6451 101 -0.17 48
GU.CARD.HHZ. 2021-09-08T15:07:19.68 0.3 undecidable manual S 23 24.6531 108 -0.63 67
GU.EQUI.HHZ. 2021-09-08T15:07:19.20 0.1 positive manual P 337 41.5251 98 0.23 91
GU.POPM.HHZ. 2021-09-08T15:07:18.86 0.1 positive manual P 52 40.2264 98 0.09 95
GU.MAIM.HHZ. 2021-09-08T15:07:17.37 0.3 undecidable manual S 46 14.5743 125 -0.52 74
IV.BDI.HHZ. 2021-09-08T15:07:17.72 0.3 undecidable manual P 35 32.6451 101 0.1 96
IV.PII.HHZ. 2021-09-08T15:07:17.45 3.0 undecidable manual S 130 17.2716 119 -1.06 59
GU.CARD.HHZ. 2021-09-08T15:07:16.42 0.1 positive manual P 23 24.6531 108 0 98
IV.PII.HHZ. 2021-09-08T15:07:15.27 0.1 negative manual P 130 17.2716 119 -0.11 100
GU.MAIM.HHZ. 2021-09-08T15:07:15.09 0.1 negative manual P 46 14.5743 125 0.06 96
IV.HLNI.HHZ. 2021-09-08T15:07:00.53 3.0 undecidable manual Pg 4.46 0
IV.ESCV.HHZ. 2021-09-08T15:06:53.97 3.0 negative manual Pg 3.17 0
AC.SRN.HHZ. 2021-09-08T15:06:49.47 3.0 undecidable manual Pn -5.28 0
IV.ARVD.HHZ. 2021-09-08T15:06:48.15 3.0 undecidable manual Pn -2.92 0
IV.MOMA.HHZ. 2021-09-08T15:06:37.48 3.0 undecidable manual Pn -9.45 0
IV.GIZZ.HHZ. 2021-09-08T15:06:34.77 3.0 negative manual Pg 0.92 0
IT.PLTA.HNZ. 2021-09-08T15:06:25.90 3.0 undecidable manual S -9.99 0
IV.TDS.HHZ. 2021-09-08T15:06:22.11 3.0 undecidable manual P -3.3 0
IV.INTR.HHZ. 2021-09-08T15:06:22.99 3.0 undecidable manual Pg -6.56 0
IV.RNI2.HHZ. 2021-09-08T15:06:21.43 3.0 undecidable manual P -3.53 0
IV.MCEL.HHZ. 2021-09-08T15:06:18.61 3.0 undecidable manual S -4.19 0
IV.SIRI.HHZ. 2021-09-08T15:06:12.16 3.0 undecidable manual P -3.36 0
IV.MCEL.HHZ. 2021-09-08T15:06:08.99 3.0 negative manual P -3.74 0
IX.MNT3.EHZ.02 2021-09-08T15:06:03.42 3.0 undecidable manual P -6.49 0
IV.PZUN.HHZ. 2021-09-08T15:06:01.68 3.0 positive manual P -5.23 0
IX.SSB3.HHZ.02 2021-09-08T15:05:59.88 3.0 negative manual P -7.27 0
IV.VULT.HHZ. 2021-09-08T15:05:56.61 3.0 positive manual P -4.64 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MAIM.HHN. ML:1.9 0.0007225 0.52 AML other m 2021-09-08T15:07:17.64
GU.MAIM.HHE. ML:1.8 0.00047050000000000005 0.16 AML other m 2021-09-08T15:07:17.52
IV.PII.HHN. ML:2.3 0.0015350000000000001 0.26 AML other m 2021-09-08T15:07:17.83
IV.PII.HHE. ML:2.3 0.00138 0.1 AML other m 2021-09-08T15:07:17.97
GU.CARD.HHE. ML:1.9 0.0004425 0.18 AML other m 2021-09-08T15:07:19.85
GU.CARD.HHN. ML:1.9 0.00038950000000000003 0.16 AML other m 2021-09-08T15:07:20.54
GU.POPM.HHE. ML:1.6 0.00011999999999999999 0.74 AML other m 2021-09-08T15:07:25.22
GU.EQUI.HHE. ML:1.2 0.000047550000000000004 1.48 AML other m 2021-09-08T15:07:25.97
GU.POPM.HHN. ML:1.7 0.000178 1.26 AML other m 2021-09-08T15:07:25.87
GU.EQUI.HHN. ML:1.2 0.000053150000000000004 0.54 AML other m 2021-09-08T15:07:25.97
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