Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 06-07-2021 and time 04:00:21 (Italy) in region 6 km E Massarosa (LU)

A magnitude ML 1.0 earthquake occured in region: 6 km E Massarosa (LU), on

  • 06-07-2021 02:00:21 (UTC)
  • 06-07-2021 04:00:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8940, 10.4120 at 9 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.

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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
Massarosa LU 6 22471 22471
Pescaglia LU 8 3526 25997
Lucca LU 9 89046 115043
Camaiore LU 10 32513 147556
Vecchiano PI 13 12189 159745
Viareggio LU 13 62467 222212
Capannori LU 14 46252 268464
Borgo a Mozzano LU 14 6994 275458
San Giuliano Terme PI 15 31399 306857
Stazzema LU 15 3193 310050
Pietrasanta LU 17 24007 334057
Porcari LU 18 8845 342902
Fabbriche di Vergemoli LU 18 768 343670
Seravezza LU 19 13073 356743
Gallicano LU 19 3807 360550
Villa Basilica LU 19 1633 362183
Bagni di Lucca LU 20 6161 368344
Pisa PI 20 89158 457502
Molazzana LU 20 1043 458545

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km NW of Lucca (89046 inhabitants)
13 Km E of Viareggio (62467 inhabitants)
20 Km N of Pisa (89158 inhabitants)
27 Km SE of Massa (69479 inhabitants)
33 Km SE of Carrara (63133 inhabitants)
39 Km N of Livorno (159219 inhabitants)
41 Km W of Pistoia (90315 inhabitants)
52 Km E of La Spezia (93959 inhabitants)
55 Km W of Prato (191150 inhabitants)
64 Km W of Scandicci (50609 inhabitants)
69 Km W of Firenze (382808 inhabitants)
91 Km S of Reggio nell'Emilia (171345 inhabitants)
93 Km SW of Modena (184973 inhabitants)
98 Km NW of Siena (53903 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
Reviewed
Rev100 		ML 1.0 2021-07-06
02:00:21		 43.8937 10.412 9 2021-07-06
02:15:47		 Sala Sismica INGV-Roma 92281071
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-06 02:00:21 ± 0.16
Latitude 43.8937 ± 0.0072
Longitude 10.4120 ± 0.0100
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 92281071

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 870
Semi-minor axis of confidence ellipse (meter) 623
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 53
Circular confidence region, given by single value of horizontal uncertainty (meter) 870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.64571
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 92281071
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-06 02:15:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.GRAM.HHZ. 2021-07-06T02:00:44.43 0.6 undecidable manual S 337 71.6727 50 0.89 34
IV.MPPT.EHZ. 2021-07-06T02:00:39.19 0.1 undecidable manual S 82 54.6009 50 0.21 88
IV.PLMA.HHZ. 2021-07-06T02:00:37.21 0.1 undecidable manual S 291 47.8188 50 0.05 93
IV.CRMI.HHZ. 2021-07-06T02:00:36.77 0.3 undecidable manual S 103 46.7199 50 -0.09 69
GU.GRAM.HHZ. 2021-07-06T02:00:35.58 0.3 undecidable manual P 337 71.6727 50 1.36 41
GU.EQUI.HHZ. 2021-07-06T02:00:33.55 0.1 undecidable manual S 326 36.6411 50 -0.61 82
GU.SARM.EHE. 2021-07-06T02:00:32.49 0.6 undecidable manual S 358 32.2455 50 -0.5 43
GU.POPM.HHZ. 2021-07-06T02:00:32.49 0.1 undecidable manual S 59 32.2455 50 -0.51 86
IV.MPPT.EHZ. 2021-07-06T02:00:31.89 0.6 undecidable manual P 82 54.6009 50 0.3 43
IV.BDI.HHZ. 2021-07-06T02:00:30.00 0.3 undecidable manual S 38 23.754 111 -0.34 68
IV.CRMI.HHZ. 2021-07-06T02:00:30.73 0.6 undecidable manual P 103 46.7199 50 0.36 43
IV.PII.HHZ. 2021-07-06T02:00:29.06 0.1 undecidable manual S 155 21.0678 113 -0.41 90
GU.EQUI.HHZ. 2021-07-06T02:00:29.14 0.6 positive manual P 326 36.6411 50 0.33 45
IV.PLMA.HHZ. 2021-07-06T02:00:29.55 0.3 undecidable manual P 291 47.8188 50 -0.99 51
GU.POPM.HHZ. 2021-07-06T02:00:28.40 0.3 positive manual P 59 32.2455 50 0.26 68
GU.SARM.EHE. 2021-07-06T02:00:28.39 0.1 undecidable manual P 358 32.2455 50 0.25 91
GU.CARD.HHZ. 2021-07-06T02:00:27.63 0.1 undecidable manual S 21 15.6732 120 -0.17 96
IV.PII.HHZ. 2021-07-06T02:00:26.31 0.6 undecidable manual P 155 21.0678 113 0.21 47
IV.BDI.HHZ. 2021-07-06T02:00:26.94 1.0 undecidable manual P 38 23.754 111 0.34 23
GU.CARD.HHZ. 2021-07-06T02:00:25.67 1.0 undecidable manual P 21 15.6732 120 0.54 22
GU.MAIM.HHZ. 2021-07-06T02:00:25.40 0.1 undecidable manual S 71 6.6933 144 -0.02 100
GU.MAIM.HHZ. 2021-07-06T02:00:24.46 0.6 undecidable manual P 71 6.6933 144 0.7 42
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MAIM.HHN. ML:1.0 0.00014903447 0.16 AML other m 2021-07-06T02:00:25.55
GU.MAIM.HHE. ML:0.8 0.00011133350000000001 0.08 AML other m 2021-07-06T02:00:25.60
GU.CARD.HHE. ML:1.6 0.00034899999999999997 0.08 AML other m 2021-07-06T02:00:27.89
GU.CARD.HHN. ML:1.6 0.00037643845 0.1392 AML other m 2021-07-06T02:00:28.02
IV.PII.HHE. ML:1.3 0.000130752125 0.1008 AML other m 2021-07-06T02:00:29.69
IV.PII.HHN. ML:1.3 0.000156 0.24 AML other m 2021-07-06T02:00:29.70
IV.BDI.HHN. ML:0.8 0.000038677110000000003 0.2016 AML other m 2021-07-06T02:00:30.80
IV.BDI.HHE. ML:0.8 0.00003725561 0.2208 AML other m 2021-07-06T02:00:30.50
GU.POPM.HHN. ML:1.0 0.000052449999999999994 0.98 AML other m 2021-07-06T02:00:32.57
GU.POPM.HHE. ML:1.1 0.0000577 0.16 AML other m 2021-07-06T02:00:33.62
GU.EQUI.HHE. ML:0.6 0.000014365180000000001 0.0816 AML other m 2021-07-06T02:00:34.03
GU.EQUI.HHN. ML:0.4 0.000010066572500000001 0.08 AML other m 2021-07-06T02:00:33.77
IV.MPPT.EHE. ML:0.6 0.000010218156 0.2016 AML other m 2021-07-06T02:00:40.11
IV.MPPT.EHN. ML:0.8 0.000013161457 0.1392 AML other m 2021-07-06T02:00:39.71
GU.GRAM.HHE. ML:1.2 0.000024301425000000003 0.2 AML other m 2021-07-06T02:00:45.27
GU.GRAM.HHN. ML:1.1 0.00002051084 0.2608 AML other m 2021-07-06T02:00:46.28
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