Earthquake with magnitude of ML 1.1 on date 20-05-2020 and time 06:19:56 (Italy) in region 2 km S Chiusdino (SI)

A magnitude ML 1.1 earthquake occured in region: 2 km S Chiusdino (SI), on

  • 20-05-2020 04:19:56 (UTC)
  • 20-05-2020 06:19:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.14, 11.08 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
Chiusdino SI 2 1903 1903
Montieri GR 6 1204 3107
Monticiano SI 8 1571 4678
Radicondoli SI 14 914 5592
Roccastrada GR 16 9199 14791
Castelnuovo di Val di Cecina PI 16 2231 17022
Monterotondo Marittimo GR 18 1371 18393
Massa Marittima GR 19 8375 26768
Sovicille SI 19 10116 36884

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
69 Km S of Scandicci (50609 inhabitants)
71 Km S of Firenze (382808 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
78 Km SE of Livorno (159219 inhabitants)
82 Km S of Prato (191150 inhabitants)
84 Km SE of Pisa (89158 inhabitants)
89 Km S of Pistoia (90315 inhabitants)
91 Km SE of Lucca (89046 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
Rev 100 ML 1.1 2020-05-20
04:19:56
43.14 11.08 10 2020-05-20
04:26:46
Sala Sismica INGV-Roma 79353171
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-20 04:19:56 ± 0.16
Latitude 43.14 ± 0.01
Longitude 11.08 ± 0.01
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 79353171

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1155
Semi-minor axis of confidence ellipse (meter) 691
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 326
Circular confidence region, given by single value of horizontal uncertainty (meter) 1160
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 140
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.08544
Epicentral distance of station farthest from the epicenter (degree) 0.40739
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 9
Type of magnitude ML
Reference to an origin 79353171
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-20 04:26:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ARCI.HHZ. 2020-05-20T04:20:11.43 0.6 undecidable manual S 135 0.4074 50 -0.42 45
IV.CASP.HHZ. 2020-05-20T04:20:10.94 0.3 undecidable manual S 205 0.3858 50 -0.26 70
IV.ARCI.HHZ. 2020-05-20T04:20:06.14 1.0 undecidable manual P 135 0.4074 50 0.58 21
IV.RIBO.EHZ.01 2020-05-20T04:20:05.21 0.3 undecidable manual S 188 0.1952 114 0.02 76
IV.CASP.HHZ. 2020-05-20T04:20:05.64 0.6 undecidable manual P 205 0.3858 50 0.45 45
IV.RIBO.EHZ.01 2020-05-20T04:20:02.16 1.0 undecidable manual P 188 0.1952 114 0.44 23
IV.TRIF.CHZ. 2020-05-20T04:20:02.80 0.3 undecidable manual S 258 0.1349 123 -0.34 72
IV.FROS.CHZ. 2020-05-20T04:20:01.35 0.3 undecidable manual S 38 0.0854 135 -0.3 73
IV.TRIF.CHZ. 2020-05-20T04:20:00.75 0.1 negative manual P 258 0.1349 123 0.22 98
IV.FROS.CHZ. 2020-05-20T04:19:59.86 0.1 positive manual P 38 0.0854 135 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.5 0.0004324306 0.112 AML other m 2020-05-20T04:20:01.69
IV.FROS.CHN. ML:1.4 0.00031070185 0.1376 AML other m 2020-05-20T04:20:01.56
IV.TRIF.CHE. ML:1.5 0.0002809326 0.1024 AML other m 2020-05-20T04:20:02.99
IV.TRIF.CHN. ML:1.5 0.0003374918 0.096 AML other m 2020-05-20T04:20:02.88
IV.RIBO.EHE.01 ML:0.6 2.966384E-5 0.1408 AML other m 2020-05-20T04:20:05.39
IV.CASP.HHN. ML:0.9 2.3797675E-5 0.08 AML other m 2020-05-20T04:20:11.24
IV.CASP.HHE. ML:1 3.7154375E-5 0.1216 AML other m 2020-05-20T04:20:10.00
IV.ARCI.HHE. ML:0.7 1.69239575E-5 2.16 AML other m 2020-05-20T04:20:11.79
IV.ARCI.HHN. ML:0.7 1.432836E-5 1.28 AML other m 2020-05-20T04:20:11.21
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