Earthquake (controlled explosion) with magnitude of ML 1.1 on date 27-04-2023 and time 07:27:53 (UTC) in region Costa Toscana settentrionale (Massa Carrara, Lucca, Pisa)

A magnitude ML 1.1 (controlled explosion) earthquake occured in region: Costa Toscana settentrionale (Massa Carrara, Lucca, Pisa), on

  • 27-04-2023 07:27:53 (UTC)
  • 27-04-2023 09:27:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.9690, 9.9230 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: controlled explosion.

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
Ameglia SP 11 4365 4365
Portovenere SP 12 3630 7995
Lerici SP 12 10228 18223
Ortonovo SP 16 8277 26500
Arcola SP 16 10607 37107
Sarzana SP 16 21976 59083
Castelnuovo Magra SP 16 8415 67498
La Spezia SP 17 93959 161457
Carrara MS 19 63133 224590
Massa MS 19 69479 294069
Vezzano Ligure SP 20 7356 301425
Forte dei Marmi LU 20 7510 308935
Fosdinovo MS 20 4883 313818

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km SE of La Spezia (93959 inhabitants)
19 Km SW of Carrara (63133 inhabitants)
19 Km W of Massa (69479 inhabitants)
29 Km W of Viareggio (62467 inhabitants)
48 Km NW of Pisa (89158 inhabitants)
48 Km W of Lucca (89046 inhabitants)
56 Km NW of Livorno (159219 inhabitants)
80 Km W of Pistoia (90315 inhabitants)
93 Km SE of Genova (586655 inhabitants)
95 Km W of Prato (191150 inhabitants)
98 Km SW of Parma (192836 inhabitants)
99 Km SW 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 1.1 2023-04-27
07:27:53
43.9692 9.9228 0 2024-03-01
17:18:20
Bollettino Sismico Italiano INGV 124928571
Reviewed
Rev100
ML 1.1 2023-04-27
07:27:54
43.9907 9.9402 4 2023-04-27
07:40:05
Sala Sismica INGV-Roma 116792081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-27 07:27:53 ± 0.51
Latitude 43.9692 ± 0.0297
Longitude 9.9228 ± 0.0237
Depth (km) 0 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type controlled explosion
Origin ID 124928571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 3620
Semi-minor axis of confidence ellipse (meter) 1340
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 25
Circular confidence region, given by single value of horizontal uncertainty (meter) 3620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 227
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.78061
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 124928571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-29 14:35:46

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 116792081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-27 07:40:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GATE.HHZ. 2023-04-27T07:30:12.26 3.0 undecidable manual Sg 17.76 0
IV.VAGA.HHZ. 2023-04-27T07:30:04.11 3.0 undecidable manual Sg 18.25 0
IV.ENIC.HHZ. 2023-04-27T07:29:48.29 3.0 undecidable manual Pn 6.61 0
OT.OT15.EHZ. 2023-04-27T07:29:39.07 3.0 undecidable manual Pg 17.66 0
MN.SENA.HHZ. 2023-04-27T07:29:38.03 3.0 undecidable manual Sg 7.67 0
IV.RNI2.HHZ. 2023-04-27T07:29:36.88 3.0 undecidable manual Sn -3.54 0
IV.MGR.HHZ. 2023-04-27T07:29:33.83 3.0 undecidable manual Pg 15.63 0
IV.RCAV.EHZ. 2023-04-27T07:29:32.28 3.0 undecidable manual Sg 11.25 0
CR.STON.BHZ. 2023-04-27T07:29:28.82 3.0 positive manual Pn 8.45 0
IV.ERC.EHZ. 2023-04-27T07:29:27.98 3.0 undecidable manual Pn 2.6 0
IV.CAFE.HHZ. 2023-04-27T07:29:24.32 3.0 negative manual Pg 16.559999 0
IV.SNAL.HHZ. 2023-04-27T07:29:22.89 3.0 negative manual Pg 14.49 0
IV.MCRV.HHZ. 2023-04-27T07:29:20.95 3.0 undecidable manual Pg 11.65 0
IX.SCL3.EHZ.02 2023-04-27T07:29:18.07 3.0 positive manual Pn 5.23 0
IV.MRLC.HHZ. 2023-04-27T07:29:17.26 3.0 undecidable manual Pn 5.13 0
IV.GATE.HHZ. 2023-04-27T07:29:11.56 3.0 positive manual Pg 10.43 0
IV.MMO1.EHZ. 2023-04-27T07:29:10.73 3.0 undecidable manual Sn -2.24 0
IV.PTRJ.HHZ. 2023-04-27T07:29:10.67 3.0 undecidable manual Pg 11.55 0
IV.ARVD.HHZ. 2023-04-27T07:29:05.81 3.0 undecidable manual Sg 3.63 0
IV.MAGA.HHZ. 2023-04-27T07:28:53.34 3.0 undecidable manual Sg -1.28 0
IV.FAGN.HHZ. 2023-04-27T07:28:43.56 3.0 positive manual Pn -0.53 0
IV.SSFR.HHZ. 2023-04-27T07:28:35.65 3.0 negative manual Pg 5.3 0
IV.RIBO.EHZ.01 2023-04-27T07:28:35.16 3.0 undecidable manual S -2.48 0
GU.GORR.HHZ. 2023-04-27T07:28:09.75 0.3 undecidable manual P 325 86.6466 50 -0.42 65
GU.GRAM.HHZ. 2023-04-27T07:28:05.15 0.3 undecidable manual P 11 58.8966 90 -0.64 64
IV.BDI.HHZ. 2023-04-27T07:28:04.70 0.3 undecidable manual P 79 54.7008 90 -0.24 72
GU.MAIM.HHZ. 2023-04-27T07:28:03.28 0.3 undecidable manual P 98 45.8208 90 0.11 75
MN.VLC.HHZ. 2023-04-27T07:28:02.54 0.3 undecidable manual P 60 42.5241 90 0.03 76
GU.EQUI.HHZ. 2023-04-27T07:28:00.06 0.1 undecidable manual P 40 28.5492 90 0.36 97
IV.PLMA.HHZ. 2023-04-27T07:27:56.48 0.1 positive manual P 328 10.4784 91 0.39 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLMA.HHE. ML:1.1 0.000234 1.56 AML other m 2023-04-27T07:27:58.20
IV.PLMA.HHN. ML:1.2 0.00026767284999999996 0.576 AML other m 2023-04-27T07:27:59.31
GU.EQUI.HHE. ML:1.0 0.0000525 0.34 AML other m 2023-04-27T07:28:04.64
GU.EQUI.HHN. ML:0.8 0.000035279875 0.384 AML other m 2023-04-27T07:28:09.50
IV.BDI.HHE. ML:1.0 0.0000253 0.32 AML other m 2023-04-27T07:28:15.62
GU.GRAM.HHE. ML:1.4 0.00005305 0.66 AML other m 2023-04-27T07:28:16.40
IV.BDI.HHN. ML:0.9 0.00001920926 0.1792 AML other m 2023-04-27T07:28:17.35
GU.GRAM.HHN. ML:1.4 0.000053099999999999996 0.26 AML other m 2023-04-27T07:28:17.37
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