Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 15-09-2021 and time 10:27:07 (UTC) in region 5 km SE Massarosa (LU)

A magnitude ML 1.4 earthquake occured in region: 5 km SE Massarosa (LU), on

  • 15-09-2021 10:27:07 (UTC)
  • 15-09-2021 12:27:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8320, 10.3840 at 9 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
Massarosa LU 5 22471 22471
Vecchiano PI 6 12189 34660
San Giuliano Terme PI 9 31399 66059
Lucca LU 10 89046 155105
Viareggio LU 11 62467 217572
Pisa PI 13 89158 306730
Camaiore LU 14 32513 339243
Pescaglia LU 15 3526 342769
Capannori LU 16 46252 389021
Calci PI 16 6426 395447
Porcari LU 19 8845 404292
Pietrasanta LU 19 24007 428299
Stazzema LU 20 3193 431492

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km W of Lucca (89046 inhabitants)
11 Km E of Viareggio (62467 inhabitants)
13 Km N of Pisa (89158 inhabitants)
30 Km SE of Massa (69479 inhabitants)
32 Km N of Livorno (159219 inhabitants)
36 Km SE of Carrara (63133 inhabitants)
44 Km W of Pistoia (90315 inhabitants)
54 Km SE of La Spezia (93959 inhabitants)
58 Km W of Prato (191150 inhabitants)
65 Km W of Scandicci (50609 inhabitants)
70 Km W of Firenze (382808 inhabitants)
95 Km NW of Siena (53903 inhabitants)
98 Km S of Reggio nell'Emilia (171345 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 1.4 2021-09-15
10:27:07		 43.8318 10.3845 9 2022-03-30
13:04:40		 Bollettino Sismico Italiano INGV 101754501
Reviewed
Rev100 		ML 1.5 2021-09-15
10:27:07		 43.8333 10.3925 10 2021-09-15
10:35:49		 Sala Sismica INGV-Roma 95459241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-15 10:27:07 ± 0.16
Latitude 43.8318 ± 0.0072
Longitude 10.3845 ± 0.0112
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101754501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 974
Semi-minor axis of confidence ellipse (meter) 616
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 225
Circular confidence region, given by single value of horizontal uncertainty (meter) 970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.69697
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 101754501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-07 10:35:55

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 95459241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-15 10:35:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIZZ.HHZ. 2021-09-15T10:29:06.80 3.0 undecidable manual Pg 22.23 0
OT.CGL1.HHZ. 2021-09-15T10:29:01.11 3.0 undecidable manual Pg 21.27 0
IV.LPEL.HHZ. 2021-09-15T10:28:55.47 3.0 undecidable manual Sg 13.66 0
IV.EVRN.HHZ. 2021-09-15T10:28:54.10 3.0 positive manual Pn 1.61 0
IV.LADO.EHZ. 2021-09-15T10:28:47.27 3.0 undecidable manual Pn 0.09 0
IV.ALJA.HHZ. 2021-09-15T10:28:45.36 3.0 undecidable manual Pn 0.19 0
MN.TRI.HHZ. 2021-09-15T10:28:09.04 3.0 positive manual Pg 12.28 0
IV.ATFO.HHZ. 2021-09-15T10:28:05.76 3.0 undecidable manual Sg 4.3 0
SL.LJU.BHZ. 2021-09-15T10:28:05.57 3.0 negative manual Pn 0.17 0
IV.MILN.HNZ. 2021-09-15T10:28:03.49 3.0 undecidable manual Sn -0.82 0
IV.LPEL.HHZ. 2021-09-15T10:27:59.72 3.0 undecidable manual Pn -0.69 0
IV.COR1.EHZ. 2021-09-15T10:27:42.14 3.0 undecidable manual Pn 0.94 0
IV.APEC.HHZ. 2021-09-15T10:27:36.42 3.0 undecidable manual P 0.78 0
GU.GRAM.HHZ. 2021-09-15T10:27:31.60 0.6 undecidable manual S 341 77.367 50 0.56 40
GU.GSCL.HHZ. 2021-09-15T10:27:26.99 0.6 undecidable manual S 16 59.7957 50 0.63 40
IV.CRMI.HHZ. 2021-09-15T10:27:22.72 0.6 undecidable manual S 95 47.8188 50 -0.44 44
IV.PLMA.HHZ. 2021-09-15T10:27:22.94 0.6 undecidable manual S 300 48.8178 50 -0.49 43
GU.GRAM.HHZ. 2021-09-15T10:27:21.92 0.3 undecidable manual P 341 77.367 50 0.81 54
GU.POPM.HHZ. 2021-09-15T10:27:20.24 0.6 undecidable manual S 51 38.0286 50 -0.3 46
GU.SARM.EHZ. 2021-09-15T10:27:20.59 0.6 undecidable manual S 2 39.1275 50 -0.24 46
GU.EQUI.HHZ. 2021-09-15T10:27:20.36 0.3 undecidable manual S 334 41.4252 50 -1.09 51
GU.GSCL.HHZ. 2021-09-15T10:27:19.09 0.1 undecidable manual P 16 59.7957 50 0.68 78
IV.MAGO.CHE. 2021-09-15T10:27:19.59 0.3 undecidable manual P 160 65.7897 50 0.26 66
IV.MOCL.EHZ. 2021-09-15T10:27:19.93 0.3 undecidable manual P 73 66.4779 50 0.49 62
IV.BDI.HHZ. 2021-09-15T10:27:18.36 0.6 undecidable manual S 33 30.6471 50 -0.22 47
IV.CRMI.HHZ. 2021-09-15T10:27:16.55 0.1 undecidable manual P 95 47.8188 50 -0.01 95
IV.PLMA.HHZ. 2021-09-15T10:27:16.91 0.3 undecidable manual P 300 48.8178 50 0.19 69
GU.SARM.EHZ. 2021-09-15T10:27:15.12 0.1 undecidable manual P 2 39.1275 50 -0.1 95
GU.CARD.HHZ. 2021-09-15T10:27:15.98 0.6 undecidable manual S 20 22.9548 112 -0.17 48
GU.EQUI.HHZ. 2021-09-15T10:27:15.32 0.1 undecidable manual P 334 41.4252 50 -0.26 92
GU.POPM.HHZ. 2021-09-15T10:27:14.94 0.3 undecidable manual P 51 38.0286 50 -0.11 71
IV.BDI.HHZ. 2021-09-15T10:27:13.86 0.1 undecidable manual P 33 30.6471 50 -0.06 97
IV.PII.HHZ. 2021-09-15T10:27:13.59 0.6 undecidable manual S 137 16.5723 119 -0.57 44
GU.CARD.HHZ. 2021-09-15T10:27:12.56 0.1 undecidable manual P 20 22.9548 112 0.04 99
IV.PII.HHZ. 2021-09-15T10:27:11.41 0.1 negative manual P 137 16.5723 119 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:1.6 0.00038849999999999996 1.32 AML other m 2021-09-15T10:27:13.07
IV.PII.HHE. ML:1.7 0.00045200000000000004 0.22 AML other m 2021-09-15T10:27:14.12
GU.CARD.HHE. ML:1.6 0.00028300000000000005 0.86 AML other m 2021-09-15T10:27:16.41
GU.CARD.HHN. ML:1.8 0.000406 0.5 AML other m 2021-09-15T10:27:16.71
IV.BDI.HHE. ML:1.1 0.00006665000000000001 0.26 AML other m 2021-09-15T10:27:18.37
IV.BDI.HHN. ML:1.2 0.0000739 0.38 AML other m 2021-09-15T10:27:19.24
GU.EQUI.HHE. ML:1.1 0.0000434 1.42 AML other m 2021-09-15T10:27:21.01
GU.EQUI.HHN. ML:1.2 0.00005365 0.96 AML other m 2021-09-15T10:27:21.21
IV.MOCL.EHE. ML:1.2 0.00003245 0.76 AML other m 2021-09-15T10:27:30.74
IV.MOCL.EHN. ML:1.4 0.000039399999999999995 0.42 AML other m 2021-09-15T10:27:30.51
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