Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.3 on date 20-03-2023 and time 09:21:42 (Italy) in region 2 km S Borgo a Mozzano (LU)

A magnitude ML 1.3 (quarry blast) earthquake occured in region: 2 km S Borgo a Mozzano (LU), on

  • 20-03-2023 08:21:42 (UTC)
  • 20-03-2023 09:21:42 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.9620, 10.5400 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Borgo a Mozzano LU 2 6994 6994
Bagni di Lucca LU 7 6161 13155
Villa Basilica LU 9 1633 14788
Pescaglia LU 10 3526 18314
Coreglia Antelminelli LU 12 5215 23529
Capannori LU 13 46252 69781
Barga LU 13 10034 79815
Lucca LU 13 89046 168861
Pescia PT 14 19644 188505
Gallicano LU 14 3807 192312
Porcari LU 15 8845 201157
Molazzana LU 16 1043 202200
Fabbriche di Vergemoli LU 16 768 202968
Montecarlo LU 16 4428 207396
Uzzano PT 16 5770 213166
Massa e Cozzile PT 17 7983 221149
Buggiano PT 18 8825 229974
Fosciandora LU 18 602 230576
Marliana PT 19 3210 233786
Massarosa LU 19 22471 256257
Camaiore LU 19 32513 288770
Castelnuovo di Garfagnana LU 20 5950 294720
Altopascio LU 20 15481 310201
Piteglio PT 20 1683 311884
Chiesina Uzzanese PT 20 4552 316436
Stazzema LU 20 3193 319629

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km N of Lucca (89046 inhabitants)
26 Km E of Viareggio (62467 inhabitants)
30 Km NE of Pisa (89158 inhabitants)
30 Km W of Pistoia (90315 inhabitants)
33 Km E of Massa (69479 inhabitants)
38 Km E of Carrara (63133 inhabitants)
46 Km W of Prato (191150 inhabitants)
49 Km NE of Livorno (159219 inhabitants)
56 Km W of Scandicci (50609 inhabitants)
59 Km E of La Spezia (93959 inhabitants)
61 Km W of Firenze (382808 inhabitants)
82 Km SW of Modena (184973 inhabitants)
82 Km S of Reggio nell'Emilia (171345 inhabitants)
87 Km SW of Bologna (386663 inhabitants)
95 Km S of Parma (192836 inhabitants)
95 Km SW of Carpi (70699 inhabitants)
96 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
Bulletin
Rev1000 		ML 1.3 2023-03-20
08:21:42		 43.9623 10.5405 1 2024-03-01
17:18:19		 Bollettino Sismico Italiano INGV 124145651
Reviewed
Rev100 		ML 1.4 2023-03-20
08:21:41		 43.9512 10.5352 8 2023-03-20
09:13:52		 Sala Sismica INGV-Roma 115556861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-03-20 08:21:42 ± 0.11
Latitude 43.9623 ± 0.0054
Longitude 10.5405 ± 0.0112
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 124145651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 910
Semi-minor axis of confidence ellipse (meter) 620
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 910.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.06025
Epicentral distance of station farthest from the epicenter (degree) 0.24282
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 124145651
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-12-19 16:02:26

ML:1.4

Field Value
Value 1.4
Uncertainty 0.0
Num. used stations 4
Type of magnitude ML
Reference to an origin 115556861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-03-20 09:13:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PII.HHN. 2023-03-20T08:21:47.29 0.3 undecidable manual P 183 26.6511 91 -0.31 70
GU.SARM.EHE. 2023-03-20T08:21:47.53 0.3 undecidable manual P 336 26.9508 91 -0.12 72
MN.VLC.HNZ. 2023-03-20T08:21:46.99 0.3 undecidable manual P 331 25.0527 91 -0.28 70
GU.POPM.HHZ. 2023-03-20T08:21:46.18 0.1 undecidable manual P 62 19.5693 91 0.02 100
IV.BDI.HHZ. 2023-03-20T08:21:44.81 0.3 undecidable manual P 22 11.9769 92 0.16 74
GU.CARD.HHN. 2023-03-20T08:21:44.07 0.1 undecidable manual P 327 8.4804 93 0.13 100
GU.MAIM.HHZ. 2023-03-20T08:21:43.83 0.1 positive manual P 216 6.6933 94 0.24 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BDI.HHN. ML:1.2 0.000277 0.4 AML other m 2023-03-20T08:21:47.57
IV.BDI.HHE. ML:1.2 0.000273 0.4 AML other m 2023-03-20T08:21:48.93
GU.POPM.HHN. ML:1.4 0.000194 1.78 AML other m 2023-03-20T08:21:49.98
GU.POPM.HHE. ML:1.4 0.000209 0.26 AML other m 2023-03-20T08:21:51.56
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