Earthquake with magnitude of ML 0.8 on date 21-09-2020 and time 22:54:33 (UTC) in region 3 km NW Vecchiano (PI)

A magnitude ML 0.8 earthquake occured in region: 3 km NW Vecchiano (PI), on

  • 21-09-2020 22:54:33 (UTC)
  • 22-09-2020 00:54:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8, 10.37 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 8 22471 66059
Pisa PI 10 89158 155217
Lucca LU 12 89046 244263
Viareggio LU 12 62467 306730
Calci PI 15 6426 313156
Camaiore LU 16 32513 345669
Capannori LU 17 46252 391921
Pescaglia LU 19 3526 395447
Buti PI 19 5791 401238

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km N of Pisa (89158 inhabitants)
12 Km W of Lucca (89046 inhabitants)
12 Km SE of Viareggio (62467 inhabitants)
28 Km N of Livorno (159219 inhabitants)
32 Km SE of Massa (69479 inhabitants)
38 Km SE of Carrara (63133 inhabitants)
46 Km W of Pistoia (90315 inhabitants)
55 Km SE of La Spezia (93959 inhabitants)
59 Km W of Prato (191150 inhabitants)
65 Km W of Scandicci (50609 inhabitants)
71 Km W of Firenze (382808 inhabitants)
94 Km NW of Siena (53903 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 0.8 2020-09-21
22:54:33
43.8 10.37 11 2020-09-21
23:08:03
Sala Sismica INGV-Roma 83117971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-21 22:54:33 ± 0.24
Latitude 43.80 ± 0.01
Longitude 10.37 ± 0.02
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 83117971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1480
Semi-minor axis of confidence ellipse (meter) 830
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 1480
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 211
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.1385
Epicentral distance of station farthest from the epicenter (degree) 0.43887
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 83117971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-21 23:08:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CRMI.HHZ. 2020-09-21T22:54:48.07 0.6 undecidable manual S 91 0.4389 50 -0.5 58
MN.VLC.HHZ. 2020-09-21T22:54:46.25 0.3 undecidable manual S 2 0.3552 50 0.16 95
GU.SARM.EHE. 2020-09-21T22:54:46.86 0.3 undecidable manual S 3 0.3804 50 0.03 97
GU.EQUI.HHZ. 2020-09-21T22:54:46.15 0.3 undecidable manual S 337 0.3939 50 -1.09 68
GU.POPM.HHZ. 2020-09-21T22:54:46.39 0.6 undecidable manual S 49 0.3678 50 -0.06 64
IV.BDI.HHZ. 2020-09-21T22:54:44.42 0.6 undecidable manual S 32 0.3049 50 -0.17 64
GU.CARD.HHZ. 2020-09-21T22:54:42.34 0.3 undecidable manual S 20 0.2356 50 -0.2 96
IV.CRMI.HHZ. 2020-09-21T22:54:42.59 0.3 undecidable manual P 91 0.4389 50 0.58 84
MN.VLC.HHZ. 2020-09-21T22:54:41.03 0.3 undecidable manual P 2 0.3552 50 0.45 89
GU.SARM.EHE. 2020-09-21T22:54:41.41 0.3 undecidable manual P 3 0.3804 50 0.4 90
GU.EQUI.HHZ. 2020-09-21T22:54:40.92 0.3 undecidable manual P 337 0.3939 50 -0.32 91
GU.POPM.HHZ. 2020-09-21T22:54:40.88 0.3 undecidable manual P 49 0.3678 50 0.09 96
IV.BDI.HHZ. 2020-09-21T22:54:39.87 0.3 undecidable manual P 32 0.3049 50 0.15 96
IV.PII.HHZ. 2020-09-21T22:54:39.03 0.3 undecidable manual S 126 0.1385 125 -0.55 90
GU.MAIM.HHZ. 2020-09-21T22:54:39.47 0.3 undecidable manual S 38 0.1403 125 -0.18 99
GU.CARD.HHZ. 2020-09-21T22:54:38.72 0.3 undecidable manual P 20 0.2356 50 0.18 97
GU.MAIM.HHZ. 2020-09-21T22:54:37.22 0.3 undecidable manual P 38 0.1403 125 0.36 95
IV.PII.HHZ. 2020-09-21T22:54:36.93 0.3 undecidable manual P 126 0.1385 125 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHE. ML:1.3 0.00019 0.3 AML other m 2020-09-21T22:54:39.30
IV.PII.HHN. ML:1.3 0.0001705 0.3 AML other m 2020-09-21T22:54:39.30
GU.POPM.HHN. ML:1 2.965E-5 0.4 AML other m 2020-09-21T22:54:46.72
GU.CARD.HHE. ML:0.9 4.685082E-5 0.0768 AML other m 2020-09-21T22:54:42.50
GU.CARD.HHN. ML:0.9 4.0269755E-5 0.1664 AML other m 2020-09-21T22:54:42.80
IV.BDI.HHE. ML:0.4 1.1109285E-5 0.1792 AML other m 2020-09-21T22:54:45.34
IV.BDI.HHN. ML:0.7 1.7559475E-5 0.1024 AML other m 2020-09-21T22:54:45.36
IV.BDI.HNE. ML:0.9 2.9162865E-5 0.9856 AML other m 2020-09-21T22:54:45.71
GU.POPM.HHE. ML:0.8 2.0749405E-5 0.0896 AML other m 2020-09-21T22:54:46.70
MN.VLC.HHE. ML:0.5 1.22810375E-5 0.128 AML other m 2020-09-21T22:54:46.46
MN.VLC.HHN. ML:0.6 1.65461965E-5 0.7808 AML other m 2020-09-21T22:54:46.58
MN.VLC.HNE. ML:1.1 4.023631E-5 1.28 AML other m 2020-09-21T22:54:47.12
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