Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 01-12-2020 and time 21:02:37 (Italy) in region 2 km E Forte dei Marmi (LU)

A magnitude ML 1.9 earthquake occured in region: 2 km E Forte dei Marmi (LU), on

  • 01-12-2020 20:02:37 (UTC)
  • 01-12-2020 21:02:37 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.96, 10.19 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Forte dei Marmi LU 2 7510 7510
Pietrasanta LU 3 24007 31517
Seravezza LU 5 13073 44590
Montignoso MS 6 10323 54913
Massa MS 9 69479 124392
Stazzema LU 10 3193 127585
Camaiore LU 10 32513 160098
Viareggio LU 12 62467 222565
Carrara MS 15 63133 285698
Massarosa LU 16 22471 308169
Ortonovo SP 18 8277 316446
Pescaglia LU 18 3526 319972
Vagli Sotto LU 18 939 320911
Fabbriche di Vergemoli LU 19 768 321679

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km SE of Massa (69479 inhabitants)
12 Km NW of Viareggio (62467 inhabitants)
15 Km SE of Carrara (63133 inhabitants)
29 Km W of Lucca (89046 inhabitants)
33 Km NW of Pisa (89158 inhabitants)
33 Km E of La Spezia (93959 inhabitants)
47 Km N of Livorno (159219 inhabitants)
59 Km W of Pistoia (90315 inhabitants)
74 Km W of Prato (191150 inhabitants)
83 Km W of Scandicci (50609 inhabitants)
88 Km W of Firenze (382808 inhabitants)
89 Km SW of Reggio nell'Emilia (171345 inhabitants)
94 Km S of Parma (192836 inhabitants)
96 Km SW of Modena (184973 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.9 2020-12-01
20:02:37		 43.96 10.19 8 2020-12-01
20:11:30		 Sala Sismica INGV-Roma 85135341
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-01 20:02:37 ± 0.15
Latitude 43.96 ± 0.01
Longitude 10.19 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85135341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1025
Semi-minor axis of confidence ellipse (meter) 359
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 14
Circular confidence region, given by single value of horizontal uncertainty (meter) 1020
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59535
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 85135341
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-01 20:11:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.AGLI.HHZ. 2020-12-01T20:03:58.56 3.0 undecidable manual Sn 0 0
IV.GATE.HHZ. 2020-12-01T20:03:52.48 3.0 positive manual Pg 11.39 0
ST.CARE.EHZ. 2020-12-01T20:03:23.25 3.0 positive manual Pg 6.48 0
IV.NDIM.HHZ. 2020-12-01T20:03:13.04 3.0 undecidable manual S 0.54 0
IV.CRMI.HHZ. 2020-12-01T20:02:58.68 0.6 undecidable manual S 106 0.5945 50 0.6 42
IV.MSSA.HHZ. 2020-12-01T20:02:57.77 0.6 undecidable manual S 306 0.5954 50 -0.34 45
GU.GRAM.HHZ. 2020-12-01T20:02:56.70 0.6 undecidable manual S 351 0.5333 50 0.43 45
IV.RUFI.EHZ. 2020-12-01T20:02:56.90 3.0 positive manual P 1.02 0
GU.GENL.EHZ. 2020-12-01T20:02:54.22 3.0 undecidable manual P 0
GU.POPM.HHZ. 2020-12-01T20:02:52.71 0.6 undecidable manual S 79 0.4173 50 -0.1 50
IV.PII.HHZ. 2020-12-01T20:02:50.34 0.3 undecidable manual S 135 0.3435 50 -0.29 73
IV.BDI.HHZ. 2020-12-01T20:02:49.17 0.3 undecidable manual S 71 0.3094 103 -0.3 73
IV.CRMI.HHZ. 2020-12-01T20:02:49.68 0.1 undecidable manual P 106 0.5945 50 0.4 90
GU.GRAM.HHZ. 2020-12-01T20:02:48.36 0.1 undecidable manual P 351 0.5333 50 0.12 96
IV.MSSA.HHZ. 2020-12-01T20:02:48.64 0.1 undecidable manual P 306 0.5954 50 -0.66 82
IV.PLMA.HHZ. 2020-12-01T20:02:47.27 0.3 undecidable manual S 290 0.2545 105 -0.17 76
GU.POPM.HHZ. 2020-12-01T20:02:46.41 1.0 positive manual P 79 0.4173 50 0.17 24
GU.CARD.HHZ. 2020-12-01T20:02:45.99 0.3 undecidable manual S 74 0.2203 108 -0.17 76
IV.BDI.HHZ. 2020-12-01T20:02:44.32 1.0 negative manual P 71 0.3094 103 0.01 26
IV.PII.HHZ. 2020-12-01T20:02:44.85 0.1 undecidable manual P 135 0.3435 50 -0.13 100
IV.PLMA.HHZ. 2020-12-01T20:02:43.69 0.1 undecidable manual P 290 0.2545 105 0.54 92
GU.CARD.HHZ. 2020-12-01T20:02:42.55 0.6 positive manual P 74 0.2203 108 0.14 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CARD.HHE. ML:1.7 0.000304 0.46 AML other m 2020-12-01T20:02:46.21
IV.PII.HHN. ML:1.8 0.0002535 0.3 AML other m 2020-12-01T20:02:50.82
IV.PII.HHE. ML:1.9 0.000284 0.22 AML other m 2020-12-01T20:02:50.87
GU.CARD.HHN. ML:1.7 0.0003075 0.14 AML other m 2020-12-01T20:02:51.69
GU.POPM.HHE. ML:1.9 0.000257 0.22 AML other m 2020-12-01T20:02:53.05
GU.POPM.HHN. ML:1.9 0.0002425 0.46 AML other m 2020-12-01T20:02:58.24
IV.MSSA.HHE. ML:2 0.0001955 1.58 AML other m 2020-12-01T20:03:03.91
IV.MSSA.HHN. ML:2.1 0.0002235 0.42 AML other m 2020-12-01T20:03:17.31
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download