Earthquake with magnitude of ML 1.4 on date 11-10-2021 and time 06:57:45 (Italy) in region 7 km NW Monterotondo Marittimo (GR)

A magnitude ML 1.4 earthquake occured in region: 7 km NW Monterotondo Marittimo (GR), on

  • 11-10-2021 04:57:45 (UTC)
  • 11-10-2021 06:57:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.199, 10.807 at 5 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
Monterotondo Marittimo GR 7 1371 1371
Monteverdi Marittimo PI 8 758 2129
Castelnuovo di Val di Cecina PI 8 2231 4360
Pomarance PI 13 5897 10257
Sassetta LI 15 514 10771
Castagneto Carducci LI 17 9010 19781
Suvereto LI 17 3072 22853
Massa Marittima GR 18 8375 31228
Bibbona LI 19 3175 34403
Montieri GR 19 1204 35607
Guardistallo PI 19 1234 36841
Casale Marittimo PI 19 1122 37963

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km W of Siena (53903 inhabitants)
55 Km NW of Grosseto (82087 inhabitants)
56 Km SE of Livorno (159219 inhabitants)
66 Km SE of Pisa (89158 inhabitants)
69 Km SW of Scandicci (50609 inhabitants)
73 Km SW of Firenze (382808 inhabitants)
76 Km SE of Lucca (89046 inhabitants)
79 Km SW of Prato (191150 inhabitants)
82 Km S of Pistoia (90315 inhabitants)
87 Km SE of Viareggio (62467 inhabitants)
92 Km W of Arezzo (99543 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 1.4 2021-10-11
04:57:45
43.1992 10.8072 5 2021-10-11
05:09:03
Sala Sismica INGV-Roma 96420951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-11 04:57:45 ± 0.12
Latitude 43.1992 ± 0.0090
Longitude 10.8072 ± 0.0099
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96420951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1093
Semi-minor axis of confidence ellipse (meter) 488
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 217
Circular confidence region, given by single value of horizontal uncertainty (meter) 1090
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.59895
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 96420951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-11 05:09:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2021-10-11T04:58:02.69 0.6 undecidable manual S 44 0.4551 50 0.35 44
IV.CSNT.HHE. 2021-10-11T04:58:01.21 0.6 undecidable manual S 52 0.4452 50 -0.85 37
TV.SF04.EHZ. 2021-10-11T04:57:59.90 1.0 undecidable manual P -0.09 0.4
IV.CELB.HHZ. 2021-10-11T04:57:57.94 3.0 positive manual P -0.03 0
IV.ARCI.HHZ. 2021-10-11T04:57:57.77 0.3 positive manual P 125 0.5989 50 0.26 66
IV.PII.HHE. 2021-10-11T04:57:56.20 1.0 undecidable manual P 339 0.5612 50 -0.67 20
IV.OSSC.HHZ. 2021-10-11T04:57:55.13 0.6 negative manual P 44 0.4551 50 0.09 47
IV.FROS.CHZ. 2021-10-11T04:57:55.22 0.6 undecidable manual S 87 0.2545 100 0.19 48
IV.CSNT.HHE. 2021-10-11T04:57:54.82 1.0 undecidable manual P 52 0.4452 50 -0.06 24
IV.CASP.HHZ. 2021-10-11T04:57:54.15 1.0 undecidable manual P 174 0.4101 96 -0.1 24
IV.FROS.CHZ. 2021-10-11T04:57:51.05 1.0 negative manual P 87 0.2545 100 0.23 24
IV.MAGO.CHZ. 2021-10-11T04:57:50.24 0.6 undecidable manual S 304 0.1313 109 -0.19 49
IV.TRIF.CHZ. 2021-10-11T04:57:49.04 0.6 undecidable manual S 140 0.1097 113 -0.59 44
IV.MAGO.CHZ. 2021-10-11T04:57:48.34 0.1 negative manual P 304 0.1313 109 0.17 98
IV.TRIF.CHZ. 2021-10-11T04:57:47.80 0.1 negative manual P 140 0.1097 113 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHN. ML:1.5 0.0004695 0.8 AML other m 2021-10-11T04:57:49.69
IV.MAGO.CHE. ML:1.8 0.000768 0.14 AML other m 2021-10-11T04:57:50.67
IV.MAGO.CHN. ML:1.8 0.0006565 0.08 AML other m 2021-10-11T04:57:50.75
IV.TRIF.CHE. ML:1.5 0.00046 0.64 AML other m 2021-10-11T04:57:50.99
IV.FROS.CHN. ML:1.3 0.0001069 1.04 AML other m 2021-10-11T04:57:56.88
IV.FROS.CHE. ML:1.2 8.58E-5 1.16 AML other m 2021-10-11T04:57:56.33
IV.CASP.HHN. ML:1.1 3.55E-5 0.6 AML other m 2021-10-11T04:58:00.36
IV.CASP.HHE. ML:0.8 2.125E-5 0.16 AML other m 2021-10-11T04:58:01.23
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