Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.7 on date 17-11-2021 and time 23:19:11 (Italy) in region 4 km SW Lucca (LU)

A magnitude ML 0.7 earthquake occured in region: 4 km SW Lucca (LU), on

  • 17-11-2021 22:19:11 (UTC)
  • 17-11-2021 23:19:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.8160, 10.4640 at 14 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
Lucca LU 4 89046 89046
San Giuliano Terme PI 6 31399 120445
Vecchiano PI 7 12189 132634
Capannori LU 10 46252 178886
Calci PI 11 6426 185312
Massarosa LU 11 22471 207783
Pisa PI 12 89158 296941
Porcari LU 13 8845 305786
Buti PI 14 5791 311577
Vicopisano PI 16 8559 320136
Montecarlo LU 17 4428 324564
Cascina PI 17 45257 369821
Altopascio LU 17 15481 385302
Bientina PI 17 8062 393364
Pescaglia LU 17 3526 396890
Viareggio LU 18 62467 459357
Camaiore LU 19 32513 491870
Calcinaia PI 19 12439 504309
Borgo a Mozzano LU 19 6994 511303
Villa Basilica LU 19 1633 512936

Municipalities with at least 50000 inhabitants

An earthquake occurred to
4 Km SW of Lucca (89046 inhabitants)
12 Km NE of Pisa (89158 inhabitants)
18 Km E of Viareggio (62467 inhabitants)
32 Km NE of Livorno (159219 inhabitants)
36 Km SE of Massa (69479 inhabitants)
39 Km W of Pistoia (90315 inhabitants)
41 Km SE of Carrara (63133 inhabitants)
51 Km W of Prato (191150 inhabitants)
58 Km W of Scandicci (50609 inhabitants)
60 Km SE of La Spezia (93959 inhabitants)
64 Km W of Firenze (382808 inhabitants)
89 Km NW of Siena (53903 inhabitants)
99 Km S of Reggio nell'Emilia (171345 inhabitants)
99 Km SW of Modena (184973 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 0.7 2021-11-17
22:19:11		 43.8165 10.4642 14 2022-03-30
13:04:19		 Bollettino Sismico Italiano INGV 98058141
Reviewed
Rev100 		ML 0.6 2021-11-17
22:19:11		 43.821 10.4417 11 2021-11-17
22:27:40		 Sala Sismica INGV-Roma 97530551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-17 22:19:11 ± 0.17
Latitude 43.8165 ± 0.0054
Longitude 10.4642 ± 0.0174
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 98058141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1439
Semi-minor axis of confidence ellipse (meter) 311
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 74
Circular confidence region, given by single value of horizontal uncertainty (meter) 1440.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.09893
Epicentral distance of station farthest from the epicenter (degree) 0.41459
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 97530551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-17 22:27:40

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 98058141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-02-08 16:19:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BDI.HNZ. 2021-11-17T22:19:21.76 0.6 undecidable manual S 21 29.2485 99 0.08 48
GU.CARD.HHZ. 2021-11-17T22:19:19.75 0.3 undecidable manual S 4 23.2545 103 -0.37 68
GU.EQUI.HHN. 2021-11-17T22:19:19.82 0.3 undecidable manual P 327 46.0206 94 -0.07 69
IV.BDI.HNZ. 2021-11-17T22:19:17.62 0.3 undecidable manual P 21 29.2485 99 0.3 69
IV.PII.HHZ. 2021-11-17T22:19:17.03 0.3 undecidable manual S 155 11.5773 128 -0.23 72
GU.MAIM.HHZ. 2021-11-17T22:19:17.08 0.3 undecidable manual S 12 10.9779 131 -0.06 75
GU.CARD.HHZ. 2021-11-17T22:19:16.49 0.3 undecidable manual P 4 23.2545 103 0.08 73
GU.MAIM.HHZ. 2021-11-17T22:19:14.89 0.1 undecidable manual P 12 10.9779 131 0.19 97
IV.PII.HHZ. 2021-11-17T22:19:14.81 0.1 negative manual P 155 11.5773 128 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:0.7 0.000049787474999999995 0.704 AML other m 2021-11-17T22:19:17.48
GU.MAIM.HHN. ML:0.7 0.00005469469 0.5248 AML other m 2021-11-17T22:19:17.48
IV.PII.HHE. ML:0.7 0.00005199133 0.3328 AML other m 2021-11-17T22:19:17.32
GU.MAIM.HHE. ML:0.5 0.000032183675 0.64 AML other m 2021-11-17T22:19:17.36
GU.CARD.HHE. ML:0.9 0.00004379368999999999 0.96 AML other m 2021-11-17T22:19:20.26
GU.CARD.HHN. ML:0.8 0.00004139519499999999 0.768 AML other m 2021-11-17T22:19:20.25
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