Earthquake with magnitude of ML 1.5 on date 06-12-2021 and time 17:56:47 (Italy) in region 2 km NE Ponsacco (PI)

A magnitude ML 1.5 earthquake occured in region: 2 km NE 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) 43.632, 10.652 at 14 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.

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 6 6381 51215
Calcinaia PI 7 12439 63654
Santa Maria a Monte PI 8 13253 76907
Bientina PI 9 8062 84969
Vicopisano PI 9 8559 93528
Crespina Lorenzana PI 9 5457 98985
Cascina PI 10 45257 144242
Montopoli in Val d'Arno PI 10 11148 155390
Palaia PI 10 4612 160002
Peccioli PI 11 4807 164809
Castelfranco di Sotto PI 11 13427 178236
Buti PI 12 5791 184027
Terricciola PI 12 4627 188654
Casciana Terme Lari PI 12 12529 201183
Fauglia PI 13 3682 204865
Santa Croce sull'Arno PI 14 14601 219466
Collesalvetti LI 15 16827 236293
Calci PI 15 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
22 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.11
Latitude 43.6317 ± 0.0063
Longitude 10.6518 ± 0.0137
Depth (km) 14 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 98215381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 863
Semi-minor axis of confidence ellipse (meter) 798
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 68
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.85436
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitude information

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 Takeoff_angle Residual Weight
IV.ZEN8.EHZ. 2021-12-06T16:57:22.82 3.0 undecidable manual Pg 1.85 0
IV.IMOL.HNZ. 2021-12-06T16:57:05.35 3.0 positive manual P -2.65 0
IV.CELB.HHZ. 2021-12-06T16:57:05.60 3.0 positive manual P 0.04 0
IV.CASP.HNE. 2021-12-06T16:57:03.79 0.6 undecidable manual P 169 0.8544 92 0.53 40
IV.BDI.HHZ. 2021-12-06T16:57:02.54 0.6 undecidable manual S 355 0.4326 95 0.01 49
IV.OSSC.HHZ. 2021-12-06T16:57:02.79 0.3 undecidable manual S 104 0.4434 95 -0.06 72
GU.POPM.HHZ. 2021-12-06T16:57:01.72 0.6 undecidable manual S 10 0.42 95 -0.43 46
GU.EQUI.HHZ. 2021-12-06T16:57:00.02 0.6 undecidable manual P 326 0.6439 93 0.37 43
IV.RUFI.EHZ. 2021-12-06T16:57:00.24 0.6 negative manual P 71 0.6529 93 0.43 43
IV.MAGO.CHZ. 2021-12-06T16:56:59.94 0.6 undecidable manual S 179 0.3579 97 -0.39 46
IV.CRMI.HHZ. 2021-12-06T16:56:58.41 0.6 undecidable manual S 55 0.2878 99 0.14 50
GU.MAIM.HHZ. 2021-12-06T16:56:58.48 0.6 undecidable manual S 338 0.304 98 -0.26 49
IV.TRIF.CHN. 2021-12-06T16:56:58.86 0.3 undecidable manual P 160 0.5477 94 0.84 57
IV.FROS.CHE. 2021-12-06T16:56:58.02 1.0 undecidable manual P 139 0.5585 94 -0.18 23
IV.BDI.HHZ. 2021-12-06T16:56:56.16 0.3 undecidable manual P 355 0.4326 95 0.1 72
IV.OSSC.HHZ. 2021-12-06T16:56:56.03 0.3 undecidable manual P 104 0.4434 95 -0.21 71
GU.POPM.HHZ. 2021-12-06T16:56:55.91 0.1 undecidable manual P 10 0.42 95 0.07 97
IV.MAGO.CHZ. 2021-12-06T16:56:54.34 0.1 undecidable manual P 179 0.3579 97 -0.45 92
IV.CRMI.HHZ. 2021-12-06T16:56:53.42 0.1 undecidable manual P 55 0.2878 99 -0.17 98
GU.MAIM.HHZ. 2021-12-06T16:56:53.90 0.1 undecidable manual P 338 0.304 98 0.03 100
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
GU.MAIM.HHE. ML:1.3 7.653743E-5 0.512 AML other m 2021-12-06T16:57:04.96
IV.CRMI.HHE. ML:1.2 7.0939355E-5 0.1792 AML other m 2021-12-06T16:56:58.84
GU.MAIM.HHN. ML:1.3 8.490349E-5 0.1536 AML other m 2021-12-06T16:57:00.06
IV.MAGO.CHN. ML:1.7 0.00017494655 0.1152 AML other m 2021-12-06T16:57:00.46
IV.OSSC.HHN. ML:1.6 9.51E-5 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.POPM.HHE. ML:1.8 0.0001575027 0.1536 AML other m 2021-12-06T16:57:05.59
IV.MAGO.CHE. ML:1.7 0.0001590628 0.2688 AML other m 2021-12-06T16:57:05.57
GU.GRAM.HHE. ML:2.3 0.000166 0.32 AML other m 2021-12-06T16:57:22.50
GU.GRAM.HHN. ML:2.1 0.00010895 0.84 AML other m 2021-12-06T16:57:23.98
IV.CRMI.HNE. ML:1.4 0.00012224645 0.4096 AML other m 2021-12-06T16:57:03.03
IV.CRMI.HNN. ML:1.7 0.000194699925 0.7808 AML other m 2021-12-06T16:57:10.69
IV.BDI.HHE. ML:1.3 5.690208E-5 0.2944 AML other m 2021-12-06T16:57:09.42
IV.BDI.HHN. ML:1.3 4.96101E-5 0.3072 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