Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 18-12-2021 and time 06:22:33 (Italy) in region 2 km SE Santo Stefano di Magra (SP)

A magnitude ML 1.4 earthquake occured in region: 2 km SE Santo Stefano di Magra (SP), on

  • 18-12-2021 05:22:33 (UTC)
  • 18-12-2021 06:22:33 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1520, 9.9370 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
Santo Stefano di Magra SP 2 9360 9360
Vezzano Ligure SP 4 7356 16716
Sarzana SP 5 21976 38692
Arcola SP 5 10607 49299
Bolano SP 5 7813 57112
Follo SP 6 6337 63449
Podenzana MS 6 2180 65629
Fosdinovo MS 7 4883 70512
Aulla MS 7 11263 81775
Lerici SP 9 10228 92003
Castelnuovo Magra SP 9 8415 100418
Ameglia SP 10 4365 104783
Tresana MS 10 2044 106827
La Spezia SP 10 93959 200786
Ortonovo SP 11 8277 209063
Calice al Cornoviglio SP 13 1138 210201
Portovenere SP 13 3630 213831
Riccò del Golfo di Spezia SP 14 3698 217529
Beverino SP 14 2429 219958
Licciana Nardi MS 15 4949 224907
Carrara MS 15 63133 288040
Villafranca in Lunigiana MS 16 4770 292810
Riomaggiore SP 17 1576 294386
Pignone SP 17 565 294951
Fivizzano MS 18 7925 302876
Rocchetta di Vara SP 18 703 303579
Borghetto di Vara SP 19 938 304517
Bagnone MS 19 1887 306404
Mulazzo MS 19 2424 308828
Brugnato SP 19 1270 310098
Casola in Lunigiana MS 20 988 311086
Filattiera MS 20 2309 313395

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km E of La Spezia (93959 inhabitants)
15 Km NW of Carrara (63133 inhabitants)
21 Km NW of Massa (69479 inhabitants)
40 Km NW of Viareggio (62467 inhabitants)
57 Km NW of Lucca (89046 inhabitants)
61 Km NW of Pisa (89158 inhabitants)
73 Km NW of Livorno (159219 inhabitants)
79 Km SW of Parma (192836 inhabitants)
82 Km SW of Reggio nell'Emilia (171345 inhabitants)
82 Km W of Pistoia (90315 inhabitants)
85 Km E of Genova (586655 inhabitants)
96 Km SW of Modena (184973 inhabitants)
98 Km W of Prato (191150 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 2021-12-18
05:22:33		 44.152 9.9368 9 2022-03-30
13:04:23		 Bollettino Sismico Italiano INGV 98789901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-18 05:22:33 ± 0.12
Latitude 44.1520 ± 0.0081
Longitude 9.9368 ± 0.0075
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 98789901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 869
Semi-minor axis of confidence ellipse (meter) 279
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 168
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) 89
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.60344
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 98789901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-14 18:10:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LPEL.HHZ. 2021-12-18T05:24:33.27 3.0 undecidable manual Sg 9.52 0
IV.IFOR.HHZ. 2021-12-18T05:24:31.94 3.0 undecidable manual Sn -9.91 0
MN.TRI.HHZ. 2021-12-18T05:24:14.21 3.0 undecidable manual Sg 7.39 0
OT.OT17.EHZ. 2021-12-18T05:23:57.57 3.0 negative manual Pg 8.4 0
IT.GLNS.HNZ. 2021-12-18T05:23:55.56 3.0 undecidable manual Pg 11.96 0
IV.CAFE.HHZ. 2021-12-18T05:23:55.25 3.0 undecidable manual Pn 1.72 0
IV.CDRU.HHZ. 2021-12-18T05:23:52.19 3.0 undecidable manual Pn -6.84 0
IV.MC2.EHZ. 2021-12-18T05:23:50.79 3.0 undecidable manual Sn -6.42 0
IV.PTRJ.HHZ. 2021-12-18T05:23:40.24 3.0 undecidable manual Pn -4.7 0
IV.POFI.HHZ. 2021-12-18T05:23:32.22 3.0 negative manual Pn -3.2 0
IV.VOBA.EHZ. 2021-12-18T05:23:23.06 3.0 undecidable manual S -2.82 0
IV.PCN.EHZ. 2021-12-18T05:22:54.34 3.0 positive manual P 1.48 0
IV.BDI.HHZ. 2021-12-18T05:22:50.39 0.3 undecidable manual S 100 53.4021 50 -0.19 70
GU.CARD.HHZ. 2021-12-18T05:22:47.84 0.3 undecidable manual S 108 45.621 50 -0.67 62
IV.MSSA.HHZ. 2021-12-18T05:22:46.01 0.3 undecidable manual S 299 38.0286 50 -0.46 68
IV.PII.HHZ. 2021-12-18T05:22:45.93 0.3 undecidable manual P 135 66.9774 50 0.51 63
IV.BDI.HHZ. 2021-12-18T05:22:43.43 0.3 undecidable manual P 100 53.4021 50 0.1 71
GU.MAIM.HHZ. 2021-12-18T05:22:43.17 0.3 undecidable manual P 121 51.6039 50 0.12 71
IV.ERBM.EHE. 2021-12-18T05:22:43.20 0.3 undecidable manual P 52 48.0186 50 0.7 61
GU.CARD.HHZ. 2021-12-18T05:22:42.26 0.3 undecidable manual P 108 45.621 50 0.13 72
GU.GRAM.HHZ. 2021-12-18T05:22:41.23 0.1 undecidable manual P 15 38.9277 50 0.14 96
GU.FIVI.HNE. 2021-12-18T05:22:40.17 0.3 undecidable manual S 57 17.9709 117 -0.23 74
IV.MSSA.HHZ. 2021-12-18T05:22:40.76 0.3 undecidable manual P 299 38.0286 50 -0.19 72
GU.EQUI.HHZ. 2021-12-18T05:22:39.72 0.3 undecidable manual S 85 17.2716 118 -0.46 70
IV.PLMA.HHZ. 2021-12-18T05:22:38.71 0.3 undecidable manual S 210 13.1757 125 -0.24 74
GU.EQUI.HHZ. 2021-12-18T05:22:37.47 0.1 undecidable manual P 85 17.2716 118 0.15 100
GU.FIVI.HNE. 2021-12-18T05:22:37.70 0.3 undecidable manual P 57 17.9709 117 0.25 73
IV.PLMA.HHZ. 2021-12-18T05:22:36.88 0.3 undecidable manual P 210 13.1757 125 0.27 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLMA.HHN. ML:1.3 0.00023799999999999998 0.14 AML other m 2021-12-18T05:22:38.86
IV.PLMA.HHE. ML:1.4 0.00026649999999999997 0.18 AML other m 2021-12-18T05:22:38.78
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