Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 21-12-2021 and time 08:09:16 (Italy) in region 4 km SE Peccioli (PI)

A magnitude ML 1.6 earthquake occured in region: 4 km SE Peccioli (PI), on

  • 21-12-2021 07:09:16 (UTC)
  • 21-12-2021 08:09:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5180, 10.7380 at 8 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
Peccioli PI 4 4807 4807
Lajatico PI 5 1336 6143
Terricciola PI 5 4627 10770
Chianni PI 8 1392 12162
Capannoli PI 9 6381 18543
Casciana Terme Lari PI 10 12529 31072
Palaia PI 10 4612 35684
Montecatini Val di Cecina PI 14 1749 37433
Ponsacco PI 14 15611 53044
Montaione FI 15 3700 56744
Santa Luce PI 15 1684 58428
Crespina Lorenzana PI 15 5457 63885
Volterra PI 16 10519 74404
Montopoli in Val d'Arno PI 17 11148 85552
Gambassi Terme FI 18 4870 90422
Castellina Marittima PI 18 2025 92447
Pontedera PI 18 29223 121670
Orciano Pisano PI 19 647 122317
Fauglia PI 19 3682 125999

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km E of Livorno (159219 inhabitants)
35 Km SE of Pisa (89158 inhabitants)
41 Km SE of Lucca (89046 inhabitants)
45 Km SW of Scandicci (50609 inhabitants)
49 Km SW of Pistoia (90315 inhabitants)
50 Km SW of Prato (191150 inhabitants)
50 Km SW of Firenze (382808 inhabitants)
53 Km W of Siena (53903 inhabitants)
55 Km SE of Viareggio (62467 inhabitants)
75 Km SE of Massa (69479 inhabitants)
81 Km SE of Carrara (63133 inhabitants)
90 Km NW of Grosseto (82087 inhabitants)
93 Km W of Arezzo (99543 inhabitants)
98 Km SE of La Spezia (93959 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 1.6 2021-12-21
07:09:16		 43.5185 10.7382 8 2022-03-30
13:04:31		 Bollettino Sismico Italiano INGV 99869401
Reviewed
Rev100 		ML 1.7 2021-12-21
07:09:16		 43.5263 10.721 2 2021-12-21
07:21:43		 Sala Sismica INGV-Roma 98781411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-21 07:09:16 ± 0.17
Latitude 43.5185 ± 0.0072
Longitude 10.7382 ± 0.0149
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99869401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 936
Semi-minor axis of confidence ellipse (meter) 831
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 262
Circular confidence region, given by single value of horizontal uncertainty (meter) 940.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 37
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.86245
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 99869401
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-06 09:35:51

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 20
Type of magnitude ML
Reference to an origin 98781411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-21 07:21:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CPOZ.HHZ. 2021-12-21T07:11:16.01 3.0 undecidable manual Sg 13.3 0
MN.PDG.HHZ. 2021-12-21T07:11:11.27 3.0 undecidable manual Pg 17.959999 0
OT.OT17.EHZ. 2021-12-21T07:11:04.72 3.0 undecidable manual Sn -3.06 0
IV.ESCV.HHZ. 2021-12-21T07:10:59.09 3.0 negative manual Pn 3.63 0
IV.ERC.EHZ. 2021-12-21T07:10:47.40 3.0 undecidable manual Pn 4.53 0
IV.PTRP.HHZ. 2021-12-21T07:10:30.22 3.0 negative manual Pn -3.96 0
SL.LJU.BHZ. 2021-12-21T07:10:22.57 3.0 positive manual Pg 6.41 0
IV.MMUR.HNZ. 2021-12-21T07:10:15.57 3.0 undecidable manual Sg 2.31 0
IV.MMUR.HNZ. 2021-12-21T07:09:49.78 3.0 positive manual Pg 1.16 0
IV.SSFR.HHZ. 2021-12-21T07:09:43.92 3.0 positive manual P -2.57 0
IV.BDI.HHZ. 2021-12-21T07:09:36.00 0.6 undecidable manual S 349 61.494 50 -0.39 43
IV.ARCI.HHZ. 2021-12-21T07:09:34.82 1.0 undecidable manual P 141 95.0382 50 1.56 12
IV.CELB.HHZ. 2021-12-21T07:09:33.98 0.3 undecidable manual P 207 95.7264 50 0.61 57
IV.CASP.HHZ. 2021-12-21T07:09:32.63 0.3 undecidable manual P 173 81.3519 50 1.47 39
IV.SEI.HHZ. 2021-12-21T07:09:32.81 0.3 undecidable manual P 40 77.4669 50 2.25 21
GU.EQUI.HHZ. 2021-12-21T07:09:32.55 0.6 undecidable manual P 327 85.7475 50 0.71 37
IV.FROS.CHZ. 2021-12-21T07:09:31.88 0.6 undecidable manual S 135 48.0186 50 -0.94 36
IV.TRIF.CHZ. 2021-12-21T07:09:31.31 0.6 undecidable manual S 163 46.7199 50 -1.15 33
GU.MAIM.HHZ. 2021-12-21T07:09:31.99 0.3 undecidable manual S 336 48.0186 50 -0.82 57
IV.CSNT.HHZ. 2021-12-21T07:09:31.13 0.6 undecidable manual S 96 44.7219 50 -0.79 39
IV.OSSC.HHE. 2021-12-21T07:09:30.32 0.6 undecidable manual S 89 40.8258 50 -0.57 43
IV.CRMI.HHZ. 2021-12-21T07:09:29.39 0.6 undecidable manual S 32 36.3414 102 -0.25 47
IV.MOCL.EHZ. 2021-12-21T07:09:29.45 0.6 undecidable manual P 33 64.5909 50 0.88 36
GU.CARD.HHZ. 2021-12-21T07:09:28.04 0.6 undecidable manual P 340 59.8956 50 0.18 46
GU.POPM.HHZ. 2021-12-21T07:09:28.31 0.3 undecidable manual P 1 58.3971 50 0.68 60
IV.BDI.HHZ. 2021-12-21T07:09:28.51 0.3 undecidable manual P 349 61.494 50 0.42 65
IV.MPPT.EHN. 2021-12-21T07:09:27.61 0.3 undecidable manual P 30 56.2992 50 0.31 67
GU.MAIM.HHZ. 2021-12-21T07:09:26.11 0.3 undecidable manual P 336 48.0186 50 0.08 71
IV.MAGO.CHZ. 2021-12-21T07:09:26.75 0.6 undecidable manual S 193 27.9498 105 -0.06 49
IV.PII.HHZ. 2021-12-21T07:09:26.02 0.3 undecidable manual S 323 28.3494 105 -0.92 57
IV.FROS.CHZ. 2021-12-21T07:09:25.97 0.3 undecidable manual P 135 48.0186 50 -0.06 72
IV.CSNT.HHZ. 2021-12-21T07:09:25.36 0.3 undecidable manual P 96 44.7219 50 -0.15 71
IV.TRIF.CHZ. 2021-12-21T07:09:25.39 0.3 undecidable manual P 163 46.7199 50 -0.43 66
IV.CRMI.HHZ. 2021-12-21T07:09:24.40 0.1 positive manual P 32 36.3414 102 0.21 95
IV.OSSC.HHE. 2021-12-21T07:09:24.95 0.3 undecidable manual P 89 40.8258 50 0.03 73
IV.PII.HHZ. 2021-12-21T07:09:22.23 0.1 undecidable manual P 323 28.3494 105 -0.4 92
IV.MAGO.CHZ. 2021-12-21T07:09:22.55 0.1 positive manual P 193 27.9498 105 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:2.0 0.0005660000000000001 0.76 AML other m 2021-12-21T07:09:26.82
IV.MAGO.CHN. ML:1.7 0.000282 0.22 AML other m 2021-12-21T07:09:27.25
IV.PII.HHE. ML:1.9 0.0004195 0.22 AML other m 2021-12-21T07:09:27.39
IV.MAGO.CHE. ML:1.5 0.00016700000000000002 1.32 AML other m 2021-12-21T07:09:29.25
IV.CRMI.HHN. ML:1.5 0.00013550000000000001 0.22 AML other m 2021-12-21T07:09:29.85
IV.CRMI.HHE. ML:1.3 0.0000814 1.5 AML other m 2021-12-21T07:09:29.98
GU.MAIM.HHE. ML:1.5 0.00008125 0.68 AML other m 2021-12-21T07:09:32.59
IV.FROS.CHE. ML:1.5 0.000096 1.58 AML other m 2021-12-21T07:09:32.92
IV.FROS.CHN. ML:1.4 0.00007300000000000001 1.26 AML other m 2021-12-21T07:09:33.15
GU.MAIM.HHN. ML:1.6 0.00010200000000000001 0.24 AML other m 2021-12-21T07:09:33.24
IV.CASP.HHE. ML:1.4 0.000032 1.58 AML other m 2021-12-21T07:09:35.89
IV.BDI.HHN. ML:1.6 0.00009114999999999999 0.42 AML other m 2021-12-21T07:09:40.65
IV.BDI.HHE. ML:1.6 0.0000853 1.56 AML other m 2021-12-21T07:09:44.91
IV.CELB.HHN. ML:1.7 0.00005325000000000001 1.04 AML other m 2021-12-21T07:09:47.10
IV.CASP.HHN. ML:1.5 0.0000454 1.54 AML other m 2021-12-21T07:09:47.18
IV.CELB.HHE. ML:1.6 0.0000449 0.6 AML other m 2021-12-21T07:09:48.06
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