Earthquake with magnitude of ML 0.7 on date 23-10-2021 and time 00:04:42 (Italy) in region 3 km N Vecchiano (PI)

A magnitude ML 0.7 earthquake occured in region: 3 km N Vecchiano (PI), on

  • 22-10-2021 22:04:42 (UTC)
  • 23-10-2021 00:04:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.811, 10.387 at 11 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 3 12189 12189
San Giuliano Terme PI 7 31399 43588
Massarosa LU 7 22471 66059
Lucca LU 10 89046 155105
Pisa PI 11 89158 244263
Viareggio LU 13 62467 306730
Calci PI 14 6426 313156
Camaiore LU 16 32513 345669
Capannori LU 16 46252 391921
Pescaglia LU 18 3526 395447
Buti PI 19 5791 401238
Porcari LU 19 8845 410083
Cascina PI 20 45257 455340

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km W of Lucca (89046 inhabitants)
11 Km N of Pisa (89158 inhabitants)
13 Km SE of Viareggio (62467 inhabitants)
29 Km N of Livorno (159219 inhabitants)
32 Km SE of Massa (69479 inhabitants)
38 Km SE of Carrara (63133 inhabitants)
45 Km W of Pistoia (90315 inhabitants)
56 Km SE of La Spezia (93959 inhabitants)
58 Km W of Prato (191150 inhabitants)
64 Km W of Scandicci (50609 inhabitants)
70 Km W of Firenze (382808 inhabitants)
94 Km NW of Siena (53903 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 0.7 2021-10-22
22:04:42
43.8112 10.3868 11 2021-10-22
22:12:32
Sala Sismica INGV-Roma 96889241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-22 22:04:42 ± 0.21
Latitude 43.8112 ± 0.0063
Longitude 10.3868 ± 0.0224
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96889241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1780
Semi-minor axis of confidence ellipse (meter) 647
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 1780
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 230
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.1268
Epicentral distance of station farthest from the epicenter (degree) 0.37232
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 96889241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-22 22:12:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BDI.HHE. 2021-10-22T22:04:54.08 0.6 undecidable manual S 31 0.2932 50 0.23 48
GU.SARM.EHE. 2021-10-22T22:04:50.40 0.3 undecidable manual P 2 0.3723 50 -0.07 73
GU.POPM.HHZ. 2021-10-22T22:04:50.17 0.6 negative manual P 49 0.3543 50 0.02 49
IV.BDI.HHE. 2021-10-22T22:04:49.02 0.3 undecidable manual P 31 0.2932 50 -0.08 74
GU.MAIM.HHZ. 2021-10-22T22:04:48.55 0.6 undecidable manual S 37 0.1268 127 -0.18 50
IV.PII.HHZ. 2021-10-22T22:04:48.67 0.6 undecidable manual S 132 0.134 126 -0.27 49
GU.CARD.HHZ. 2021-10-22T22:04:47.76 0.3 undecidable manual P 18 0.2257 50 -0.19 73
GU.MAIM.HHZ. 2021-10-22T22:04:46.36 0.3 undecidable manual P 37 0.1268 127 0.22 74
IV.PII.HHZ. 2021-10-22T22:04:46.43 0.1 undecidable manual P 132 0.134 126 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:0.8 5.651117E-5 0.0768 AML other m 2021-10-22T22:04:49.01
IV.PII.HHE. ML:0.9 7.415E-5 0.26 AML other m 2021-10-22T22:04:49.15
GU.MAIM.HHE. ML:0.5 2.785273E-5 0.1664 AML other m 2021-10-22T22:04:48.88
GU.MAIM.HHN. ML:0.6 3.857111E-5 0.1536 AML other m 2021-10-22T22:04:48.83
GU.CARD.HHE. ML:0.4 1.57626565E-5 0.0768 AML other m 2021-10-22T22:04:52.88
GU.CARD.HHN. ML:0.6 2.3427496E-5 0.0512 AML other m 2021-10-22T22:04:51.62
GU.POPM.HHE. ML:1 3.4825075E-5 0.3968 AML other m 2021-10-22T22:04:57.22
GU.POPM.HHN. ML:1.1 4.276444E-5 0.2048 AML other m 2021-10-22T22:04:57.47
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