Earthquake with magnitude of ML 1.0 on date 25-10-2021 and time 15:43:38 (Italy) in region 4 km SE Massarosa (LU)

A magnitude ML 1.0 earthquake occured in region: 4 km SE Massarosa (LU), on

  • 25-10-2021 13:43:38 (UTC)
  • 25-10-2021 15:43:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.842, 10.376 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
Massarosa LU 4 22471 22471
Vecchiano PI 7 12189 34660
Lucca LU 10 89046 123706
San Giuliano Terme PI 10 31399 155105
Viareggio LU 11 62467 217572
Camaiore LU 12 32513 250085
Pisa PI 14 89158 339243
Pescaglia LU 14 3526 342769
Capannori LU 16 46252 389021
Calci PI 17 6426 395447
Pietrasanta LU 18 24007 419454
Stazzema LU 19 3193 422647
Porcari LU 19 8845 431492

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km W of Lucca (89046 inhabitants)
11 Km E of Viareggio (62467 inhabitants)
14 Km N of Pisa (89158 inhabitants)
29 Km SE of Massa (69479 inhabitants)
33 Km N of Livorno (159219 inhabitants)
35 Km SE of Carrara (63133 inhabitants)
45 Km W of Pistoia (90315 inhabitants)
53 Km SE of La Spezia (93959 inhabitants)
58 Km W of Prato (191150 inhabitants)
65 Km W of Scandicci (50609 inhabitants)
71 Km W of Firenze (382808 inhabitants)
97 Km NW of Siena (53903 inhabitants)
97 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 2021-10-25
13:43:38
43.8418 10.3762 10 2021-10-25
13:58:32
Sala Sismica INGV-Roma 96981301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-25 13:43:38 ± 0.24
Latitude 43.8418 ± 0.0081
Longitude 10.3762 ± 0.0224
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 96981301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1817
Semi-minor axis of confidence ellipse (meter) 881
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 87
Circular confidence region, given by single value of horizontal uncertainty (meter) 1820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 196
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.10972
Epicentral distance of station farthest from the epicenter (degree) 0.36153
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:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96981301
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-25 13:58:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.SARM.EHZ. 2021-10-25T13:43:51.05 0.6 undecidable manual S 3 0.3426 50 -0.19 48
GU.EQUI.HHZ. 2021-10-25T13:43:50.96 0.3 undecidable manual S 334 0.3615 50 -0.84 58
IV.BDI.HNZ. 2021-10-25T13:43:49.14 0.3 undecidable manual S 35 0.2716 50 0.01 76
GU.EQUI.HHZ. 2021-10-25T13:43:46.47 0.3 undecidable manual P 334 0.3615 50 0.34 69
GU.CARD.HHZ. 2021-10-25T13:43:46.51 0.3 undecidable manual S 22 0.1996 114 -0.28 72
GU.SARM.EHZ. 2021-10-25T13:43:46.19 0.3 undecidable manual P 3 0.3426 50 0.39 69
IV.PII.HHZ. 2021-10-25T13:43:44.88 0.3 undecidable manual S 138 0.161 119 -0.59 67
IV.BDI.HNZ. 2021-10-25T13:43:44.73 0.1 undecidable manual P 35 0.2716 50 0.14 98
GU.CARD.HHZ. 2021-10-25T13:43:43.35 0.1 undecidable manual P 22 0.1996 114 0.12 100
GU.MAIM.HHZ. 2021-10-25T13:43:43.70 0.3 undecidable manual S 49 0.1097 129 -0.12 76
IV.PII.HHZ. 2021-10-25T13:43:42.63 0.1 undecidable manual P 138 0.161 119 0.16 100
GU.MAIM.HHZ. 2021-10-25T13:43:41.91 0.1 undecidable manual P 49 0.1097 129 0.39 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:1.1 0.00010515 0.84 AML other m 2021-10-25T13:43:44.49
IV.PII.HHE. ML:1 9.095E-5 0.44 AML other m 2021-10-25T13:43:45.22
GU.CARD.HHE. ML:1.2 0.0001125 0.16 AML other m 2021-10-25T13:43:46.96
GU.CARD.HHN. ML:1.1 8.075E-5 0.14 AML other m 2021-10-25T13:43:47.09
IV.ZEN8.EHN. ML:2.4 7.045E-5 0.06 AML other m 2021-10-25T13:44:38.16
IV.ZEN8.EHE. ML:2.2 4.78E-5 0.34 AML other m 2021-10-25T13:44:38.41
GU.MAIM.HHE. ML:0.4 2.441477E-5 0.1408 AML other m 2021-10-25T13:43:44.52
GU.MAIM.HHN. ML:0.5 3.405647E-5 0.16 AML other m 2021-10-25T13:43:43.76
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