Earthquake with magnitude of ML 1.0 on date 20-10-2021 and time 19:14:23 (Italy) in region 5 km NE Vecchiano (PI)

A magnitude ML 1.0 earthquake occured in region: 5 km NE Vecchiano (PI), on

  • 20-10-2021 17:14:23 (UTC)
  • 20-10-2021 19:14:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.828, 10.409 at 10 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vecchiano PI 5 12189 12189
Massarosa LU 7 22471 34660
San Giuliano Terme PI 8 31399 66059
Lucca LU 8 89046 155105
Pisa PI 12 89158 244263
Viareggio LU 14 62467 306730
Capannori LU 14 46252 352982
Calci PI 14 6426 359408
Camaiore LU 15 32513 391921
Pescaglia LU 16 3526 395447
Porcari LU 17 8845 404292
Buti PI 18 5791 410083
Vicopisano PI 20 8559 418642

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km W of Lucca (89046 inhabitants)
12 Km N of Pisa (89158 inhabitants)
14 Km E of Viareggio (62467 inhabitants)
32 Km N of Livorno (159219 inhabitants)
32 Km SE of Massa (69479 inhabitants)
37 Km SE of Carrara (63133 inhabitants)
43 Km W of Pistoia (90315 inhabitants)
56 Km W of Prato (191150 inhabitants)
56 Km SE of La Spezia (93959 inhabitants)
63 Km W of Scandicci (50609 inhabitants)
68 Km W of Firenze (382808 inhabitants)
94 Km NW of Siena (53903 inhabitants)
98 Km S of Reggio nell'Emilia (171345 inhabitants)
100 Km SW of Modena (184973 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.0 2021-10-20
17:14:23
43.8278 10.4093 10 2021-10-20
17:24:25
Sala Sismica INGV-Roma 96805621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 17:14:23 ± 0.29
Latitude 43.8278 ± 0.0063
Longitude 10.4093 ± 0.0274
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96805621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2198
Semi-minor axis of confidence ellipse (meter) 582
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 264
Circular confidence region, given by single value of horizontal uncertainty (meter) 2200
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 233
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.33095
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 96805621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 17:24:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.POPM.HHZ. 2021-10-20T17:14:35.87 0.3 undecidable manual S 49 0.331 50 0.11 72
IV.BDI.HHZ. 2021-10-20T17:14:33.54 0.6 undecidable manual S 30 0.2707 50 -0.43 45
GU.CARD.HHZ. 2021-10-20T17:14:31.47 0.6 undecidable manual S 15 0.205 114 -0.43 46
GU.POPM.HHZ. 2021-10-20T17:14:30.62 0.1 positive manual P 49 0.331 50 0.14 95
IV.PII.HHZ. 2021-10-20T17:14:29.16 0.6 undecidable manual S 142 0.1349 124 -0.36 47
IV.BDI.HHZ. 2021-10-20T17:14:29.48 0.1 undecidable manual P 30 0.2707 50 0.04 98
GU.MAIM.HHZ. 2021-10-20T17:14:28.89 0.6 undecidable manual S 35 0.1034 131 0.32 48
GU.CARD.HHZ. 2021-10-20T17:14:28.24 0.1 negative manual P 15 0.205 114 -0.01 100
IV.PII.HHZ. 2021-10-20T17:14:26.94 0.1 undecidable manual P 142 0.1349 124 0.07 100
GU.MAIM.HHZ. 2021-10-20T17:14:26.83 1.0 undecidable manual P 35 0.1034 131 0.5 23
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.MAIM.HHN. ML:0.9 0.0001025 0.14 AML other m 2021-10-20T17:14:29.22
GU.MAIM.HHE. ML:0.8 6.855E-5 0.14 AML other m 2021-10-20T17:14:29.28
IV.PII.HHN. ML:1.4 0.0002615 0.16 AML other m 2021-10-20T17:14:29.54
IV.PII.HHE. ML:1.4 0.0002475 0.26 AML other m 2021-10-20T17:14:29.68
GU.CARD.HHN. ML:1.1 7.445E-5 0.7 AML other m 2021-10-20T17:14:32.34
GU.CARD.HHE. ML:1.1 7.365E-5 0.42 AML other m 2021-10-20T17:14:33.18
GU.POPM.HHE. ML:0.9 3.105E-5 1.84 AML other m 2021-10-20T17:14:37.92
GU.POPM.HHN. ML:1.1 4.755E-5 1.22 AML other m 2021-10-20T17:14:37.02
IV.BDI.HHE. ML:0.6 2.0161895E-5 0.1664 AML other m 2021-10-20T17:14:34.94
IV.BDI.HHN. ML:0.6 2.1557395E-5 0.0896 AML other m 2021-10-20T17:14:34.92
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