Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 04-11-2021 and time 22:10:48 (Italy) in region 3 km W Castelnuovo Magra (SP)

A magnitude ML 1.3 earthquake occured in region: 3 km W Castelnuovo Magra (SP), on

  • 04-11-2021 21:10:48 (UTC)
  • 04-11-2021 22:10:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0900, 9.9880 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
Castelnuovo Magra SP 3 8415 8415
Sarzana SP 4 21976 30391
Ameglia SP 4 4365 34756
Ortonovo SP 4 8277 43033
Fosdinovo MS 6 4883 47916
Lerici SP 6 10228 58144
Arcola SP 7 10607 68751
Carrara MS 9 63133 131884
Santo Stefano di Magra SP 10 9360 141244
Vezzano Ligure SP 10 7356 148600
Portovenere SP 13 3630 152230
La Spezia SP 13 93959 246189
Follo SP 13 6337 252526
Bolano SP 13 7813 260339
Aulla MS 14 11263 271602
Podenzana MS 14 2180 273782
Massa MS 14 69479 343261
Tresana MS 17 2044 345305
Montignoso MS 17 10323 355628
Riccò del Golfo di Spezia SP 19 3698 359326
Casola in Lunigiana MS 20 988 360314
Fivizzano MS 20 7925 368239
Minucciano LU 20 2102 370341
Riomaggiore SP 20 1576 371917
Licciana Nardi MS 20 4949 376866

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km W of Carrara (63133 inhabitants)
13 Km E of La Spezia (93959 inhabitants)
14 Km W of Massa (69479 inhabitants)
32 Km NW of Viareggio (62467 inhabitants)
49 Km NW of Lucca (89046 inhabitants)
53 Km NW of Pisa (89158 inhabitants)
65 Km NW of Livorno (159219 inhabitants)
76 Km W of Pistoia (90315 inhabitants)
84 Km SW of Parma (192836 inhabitants)
85 Km SW of Reggio nell'Emilia (171345 inhabitants)
91 Km E of Genova (586655 inhabitants)
92 Km W of Prato (191150 inhabitants)
97 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 1.3 2021-11-04
21:10:48		 44.0898 9.9885 9 2022-03-30
13:04:17		 Bollettino Sismico Italiano INGV 97747041
Reviewed
Rev100 		ML 1.3 2021-11-04
21:10:48		 44.091 9.9877 9 2021-11-04
21:19:54		 Sala Sismica INGV-Roma 97262821
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-11-04 21:10:48 ± 0.12
Latitude 44.0898 ± 0.0081
Longitude 9.9885 ± 0.0100
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 97747041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 887
Semi-minor axis of confidence ellipse (meter) 700
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 326
Circular confidence region, given by single value of horizontal uncertainty (meter) 890.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53330
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 97747041
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-24 10:15:13

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 97262821
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-11-04 21:19:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FIR.HHZ. 2021-11-04T21:11:22.40 3.0 undecidable manual S -0.3 0
IV.PII.HHZ. 2021-11-04T21:11:06.88 0.6 undecidable manual S 133 59.1963 50 -0.41 43
GU.GRAM.HHZ. 2021-11-04T21:11:03.70 1.0 undecidable manual S 8 44.8218 50 0.23 23
IV.BDI.HNZ. 2021-11-04T21:11:03.96 0.6 undecidable manual S 93 48.5181 50 -0.48 43
GU.CARD.HHZ. 2021-11-04T21:11:01.46 0.3 undecidable manual S 100 40.0266 50 -0.71 60
GU.SARM.EHZ. 2021-11-04T21:11:00.35 0.6 undecidable manual S 72 34.4433 50 -0.34 45
IV.PII.HHZ. 2021-11-04T21:10:59.69 0.1 undecidable manual P 133 59.1963 50 0.28 88
IV.BDI.HNZ. 2021-11-04T21:10:58.13 0.1 undecidable manual P 93 48.5181 50 0.38 88
GU.MAIM.HHZ. 2021-11-04T21:10:57.29 0.1 undecidable manual P 116 44.7219 50 0.12 93
GU.GRAM.HHZ. 2021-11-04T21:10:57.35 0.1 undecidable manual P 8 44.8218 50 0.16 93
GU.CARD.HHZ. 2021-11-04T21:10:57.04 0.1 undecidable manual P 100 40.0266 50 0.59 84
IV.MSSA.HHZ. 2021-11-04T21:10:56.94 0.1 undecidable manual P 304 45.1215 50 -0.3 90
GU.SARM.EHZ. 2021-11-04T21:10:55.58 0.1 undecidable manual P 72 34.4433 50 -0.01 97
GU.FIVI.HNZ. 2021-11-04T21:10:55.91 0.3 undecidable manual S 34 19.9689 115 -0.34 70
GU.EQUI.HHZ. 2021-11-04T21:10:54.52 0.6 undecidable manual S 57 15.5733 121 -0.38 46
GU.FIVI.HNZ. 2021-11-04T21:10:53.29 0.1 undecidable manual P 34 19.9689 115 0.27 94
IV.PLMA.HHZ. 2021-11-04T21:10:53.15 0.6 undecidable manual S 248 11.5773 128 -0.62 43
GU.EQUI.HHZ. 2021-11-04T21:10:52.52 0.1 positive manual P 57 15.5733 121 0.27 95
IV.PLMA.HHZ. 2021-11-04T21:10:51.66 0.1 undecidable manual P 248 11.5773 128 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLMA.HHN. ML:1.4 0.00031094575 0.1024 AML other m 2021-11-04T21:10:53.33
IV.PLMA.HHE. ML:1.4 0.00029986365 0.1152 AML other m 2021-11-04T21:10:53.24
GU.EQUI.HHN. ML:0.8 0.000057736285 0.2048 AML other m 2021-11-04T21:10:55.21
GU.EQUI.HHE. ML:0.8 0.000057054805 0.1408 AML other m 2021-11-04T21:10:55.14
IV.MSSA.HHN. ML:1.6 0.00011131965999999999 0.1024 AML other m 2021-11-04T21:11:02.65
IV.MSSA.HHE. ML:1.5 0.00009897027999999999 0.0768 AML other m 2021-11-04T21:11:03.86
GU.GRAM.HHE. ML:1.1 0.000038473895000000004 0.6144 AML other m 2021-11-04T21:11:13.43
GU.GRAM.HHN. ML:1.4 0.00007963319500000001 0.5664 AML other m 2021-11-04T21:11:17.95
IV.PII.HHN. ML:1.3 0.000047016695 0.6176 AML other m 2021-11-04T21:11:20.02
IV.PII.HHE. ML:1.3 0.000041481329999999994 0.784 AML other m 2021-11-04T21:11:22.39
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