Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 06-12-2021 and time 16:56:47 (UTC) in region 2 km E Ponsacco (PI)

A magnitude ML 1.5 earthquake occured in region: 2 km E Ponsacco (PI), on

  • 06-12-2021 16:56:47 (UTC)
  • 06-12-2021 17:56:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6300, 10.6570 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
Ponsacco PI 2 15611 15611
Pontedera PI 4 29223 44834
Capannoli PI 5 6381 51215
Calcinaia PI 7 12439 63654
Santa Maria a Monte PI 8 13253 76907
Bientina PI 9 8062 84969
Montopoli in Val d'Arno PI 10 11148 96117
Crespina Lorenzana PI 10 5457 101574
Vicopisano PI 10 8559 110133
Palaia PI 10 4612 114745
Cascina PI 10 45257 160002
Peccioli PI 10 4807 164809
Castelfranco di Sotto PI 11 13427 178236
Terricciola PI 12 4627 182863
Casciana Terme Lari PI 12 12529 195392
Buti PI 12 5791 201183
Fauglia PI 13 3682 204865
Santa Croce sull'Arno PI 13 14601 219466
Collesalvetti LI 15 16827 236293
Calci PI 16 6426 242719
Chianni PI 16 1392 244111
Fucecchio FI 17 23618 267729
San Miniato PI 17 27934 295663
Lajatico PI 18 1336 296999
Santa Luce PI 19 1684 298683
Orciano Pisano PI 19 647 299330

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Pisa (89158 inhabitants)
27 Km SE of Lucca (89046 inhabitants)
29 Km E of Livorno (159219 inhabitants)
40 Km SW of Pistoia (90315 inhabitants)
42 Km SE of Viareggio (62467 inhabitants)
45 Km W of Scandicci (50609 inhabitants)
45 Km SW of Prato (191150 inhabitants)
51 Km W of Firenze (382808 inhabitants)
61 Km SE of Massa (69479 inhabitants)
65 Km NW of Siena (53903 inhabitants)
67 Km SE of Carrara (63133 inhabitants)
85 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 1.5 2021-12-06
16:56:47		 43.6303 10.6572 15 2022-03-30
13:04:25		 Bollettino Sismico Italiano INGV 99276101
Reviewed
Rev100 		ML 1.5 2021-12-06
16:56:47		 43.6317 10.6518 14 2021-12-06
17:05:12		 Sala Sismica INGV-Roma 98215381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-06 16:56:47 ± 0.08
Latitude 43.6303 ± 0.0036
Longitude 10.6572 ± 0.0062
Depth (km) 15 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 99276101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 558
Semi-minor axis of confidence ellipse (meter) 196
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 246
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 126
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.94159
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 99276101
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 09:34:51

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 98215381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-12-06 17:05:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ZEN8.EHZ. 2021-12-06T16:57:22.82 3.0 undecidable manual Pg 1.85 0
GU.EQUI.HHZ. 2021-12-06T16:57:08.68 0.3 undecidable manual S 326 71.7726 94 -0.12 68
IV.TRIF.CHN. 2021-12-06T16:57:05.61 0.3 undecidable manual S 161 60.495 94 -0.19 68
IV.IMOL.HNZ. 2021-12-06T16:57:05.35 3.0 positive manual P -2.65 0
IV.CELB.HHZ. 2021-12-06T16:57:05.26 0.1 undecidable manual P 200 104.5176 92 0.58 77
IV.CASP.HNE. 2021-12-06T16:57:03.79 0.6 undecidable manual P 170 94.6386 93 0.62 38
IV.OSSC.HHZ. 2021-12-06T16:57:02.79 0.3 undecidable manual S 104 48.8178 96 0.12 71
IV.BDI.HHZ. 2021-12-06T16:57:02.54 0.6 undecidable manual S 354 48.2184 96 0.01 48
GU.CARD.HHZ. 2021-12-06T16:57:01.70 0.6 undecidable manual S 342 46.1205 96 -0.26 46
GU.POPM.HHZ. 2021-12-06T16:57:01.72 0.6 undecidable manual S 10 46.7199 96 -0.4 45
IV.RUFI.EHZ. 2021-12-06T16:56:59.91 0.3 undecidable manual P 71 72.0723 94 0.22 67
IV.MAGO.CHZ. 2021-12-06T16:56:59.80 0.3 undecidable manual S 180 39.627 98 -0.45 67
GU.EQUI.HHZ. 2021-12-06T16:56:59.84 0.3 undecidable manual P 326 71.7726 94 0.19 67
IV.CRMI.HHZ. 2021-12-06T16:56:58.14 0.3 undecidable manual S 55 31.6461 101 -0.02 75
GU.MAIM.HHZ. 2021-12-06T16:56:58.86 0.3 undecidable manual S 337 34.0437 100 0.08 73
IV.TRIF.CHN. 2021-12-06T16:56:58.14 0.3 undecidable manual P 161 60.495 94 0.22 68
IV.FROS.CHE. 2021-12-06T16:56:57.99 0.3 undecidable manual P 139 61.5939 94 -0.09 70
IV.OSSC.HHZ. 2021-12-06T16:56:56.12 0.3 undecidable manual P 104 48.8178 96 0.01 73
IV.BDI.HHZ. 2021-12-06T16:56:56.16 0.3 undecidable manual P 354 48.2184 96 0.13 71
GU.CARD.HHZ. 2021-12-06T16:56:55.34 0.3 undecidable manual P 342 46.1205 96 -0.36 68
GU.POPM.HHZ. 2021-12-06T16:56:55.91 0.1 undecidable manual P 10 46.7199 96 0.12 95
IV.MAGO.CHZ. 2021-12-06T16:56:54.34 0.1 undecidable manual P 180 39.627 98 -0.37 91
IV.CRMI.HHZ. 2021-12-06T16:56:53.48 0.1 undecidable manual P 55 31.6461 101 -0.02 100
GU.MAIM.HHZ. 2021-12-06T16:56:53.90 0.1 undecidable manual P 337 34.0437 100 0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHN. ML:1.5 0.00012732129 0.2944 AML other m 2021-12-06T16:56:58.82
IV.CRMI.HHE. ML:1.2 0.000070939355 0.1792 AML other m 2021-12-06T16:56:58.84
GU.MAIM.HHN. ML:1.3 0.00008490349 0.1536 AML other m 2021-12-06T16:57:00.06
IV.MAGO.CHN. ML:1.7 0.00017494654999999999 0.1152 AML other m 2021-12-06T16:57:00.46
IV.CRMI.HNE. ML:1.4 0.00012224645 1.5904 AML other m 2021-12-06T16:57:02.03
IV.OSSC.HHN. ML:1.6 0.0000951 0.26 AML other m 2021-12-06T16:57:03.44
IV.OSSC.HHE. ML:1.7 0.0001263 0.96 AML other m 2021-12-06T16:57:03.99
GU.POPM.HHN. ML:1.9 0.0002185 0.16 AML other m 2021-12-06T16:57:04.63
GU.MAIM.HHE. ML:1.3 0.00007653743 0.512 AML other m 2021-12-06T16:57:04.96
IV.MAGO.CHE. ML:1.7 0.0001590628 0.2688 AML other m 2021-12-06T16:57:05.57
GU.POPM.HHE. ML:1.8 0.0001575027 0.1536 AML other m 2021-12-06T16:57:05.59
IV.BDI.HHE. ML:1.3 0.000056902080000000004 0.2944 AML other m 2021-12-06T16:57:09.42
IV.CRMI.HNN. ML:1.7 0.000194699925 0.7808 AML other m 2021-12-06T16:57:10.69
IV.BDI.HHN. ML:1.3 0.000049610099999999994 1.6928 AML other m 2021-12-06T16:57:10.91
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