Earthquake with magnitude of ML 1.3 on date 09-04-2021 and time 09:58:48 (Italy) in region 3 km NE Castelnuovo di Val di Cecina (PI)

A magnitude ML 1.3 earthquake occured in region: 3 km NE Castelnuovo di Val di Cecina (PI), on

  • 09-04-2021 07:58:48 (UTC)
  • 09-04-2021 09:58:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.222, 10.937 at 7 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
Castelnuovo di Val di Cecina PI 3 2231 2231
Radicondoli SI 10 914 3145
Pomarance PI 10 5897 9042
Monterotondo Marittimo GR 11 1371 10413
Montieri GR 12 1204 11617
Chiusdino SI 14 1903 13520
Casole d'Elsa SI 16 3897 17417
Monteverdi Marittimo PI 19 758 18175
Massa Marittima GR 19 8375 26550

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km W of Siena (53903 inhabitants)
53 Km N of Grosseto (82087 inhabitants)
63 Km SE of Livorno (159219 inhabitants)
63 Km SW of Scandicci (50609 inhabitants)
66 Km SW of Firenze (382808 inhabitants)
70 Km SE of Pisa (89158 inhabitants)
75 Km S of Prato (191150 inhabitants)
78 Km SE of Lucca (89046 inhabitants)
79 Km S of Pistoia (90315 inhabitants)
81 Km W of Arezzo (99543 inhabitants)
91 Km SE of Viareggio (62467 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 1.3 2021-04-09
07:58:48
43.2217 10.9372 7 2021-04-09
08:20:42
Sala Sismica INGV-Roma 88935021
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-09 07:58:48 ± 0.14
Latitude 43.2217 ± 0.0063
Longitude 10.9372 ± 0.0074
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88935021

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 681
Semi-minor axis of confidence ellipse (meter) 371
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 207
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.10972
Epicentral distance of station farthest from the epicenter (degree) 0.53959
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:1.3

Field Value
Value 1.3
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 88935021
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-09 08:20:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CASP.HHZ. 2021-04-09T07:59:04.23 0.3 undecidable manual S 187 0.4335 50 -0.37 66
IV.ARCI.HNZ. 2021-04-09T07:59:00.34 0.6 undecidable manual P 133 0.5396 50 0.77 38
IV.RIBO.EHZ.01 2021-04-09T07:58:59.47 0.1 undecidable manual S 164 0.2842 103 -0.17 95
IV.CASP.HHZ. 2021-04-09T07:58:57.84 0.6 undecidable manual P 187 0.4335 50 0.08 47
IV.MAGO.CHZ. 2021-04-09T07:58:56.71 0.1 undecidable manual S 284 0.2095 107 -0.18 96
IV.RIBO.EHZ.01 2021-04-09T07:58:54.97 0.3 undecidable manual P 164 0.2842 103 0.06 73
IV.FROS.CHZ. 2021-04-09T07:58:54.77 0.3 undecidable manual S 94 0.1601 112 -0.31 71
IV.MAGO.CHZ. 2021-04-09T07:58:53.33 0.1 undecidable manual P 284 0.2095 107 0.02 100
IV.TRIF.CHZ. 2021-04-09T07:58:53.38 0.3 undecidable manual S 193 0.1097 121 0.04 76
IV.FROS.CHZ. 2021-04-09T07:58:52.31 0.1 undecidable manual P 94 0.1601 112 0.04 100
IV.TRIF.CHZ. 2021-04-09T07:58:51.62 0.1 undecidable manual P 193 0.1097 121 0.35 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:1.4 0.0003215 0.54 AML other m 2021-04-09T07:58:53.54
IV.TRIF.CHN. ML:1.3 0.0002585 1.14 AML other m 2021-04-09T07:58:55.16
IV.FROS.CHE. ML:1.1 0.0001134 0.42 AML other m 2021-04-09T07:58:56.27
IV.MAGO.CHN. ML:1.3 0.000145 0.68 AML other m 2021-04-09T07:58:56.51
IV.MAGO.CHE. ML:1.4 0.000155 1.16 AML other m 2021-04-09T07:58:57.17
IV.FROS.CHN. ML:1.1 0.000115 1.18 AML other m 2021-04-09T07:59:02.30
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