Earthquake with magnitude of ML 1.8 on date 20-05-2020 and time 06:17:34 (Italy) in region 2 km S Chiusdino (SI)

A magnitude ML 1.8 earthquake occured in region: 2 km S Chiusdino (SI), on

  • 20-05-2020 04:17:34 (UTC)
  • 20-05-2020 06:17:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.14, 11.08 at 8 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 20 10116 36884

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
72 Km S of Firenze (382808 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
78 Km SE of Livorno (159219 inhabitants)
83 Km S of Prato (191150 inhabitants)
85 Km SE of Pisa (89158 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
92 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 1.8 2020-05-20
04:17:34
43.14 11.08 8 2020-05-20
04:25:29
Sala Sismica INGV-Roma 79353141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-20 04:17:34 ± 0.17
Latitude 43.14 ± 0.01
Longitude 11.08 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 79353141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1238
Semi-minor axis of confidence ellipse (meter) 857
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 335
Circular confidence region, given by single value of horizontal uncertainty (meter) 1240
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.43
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.74914
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 79353141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-20 04:25:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
ST.GAGG.HHZ. 2020-05-20T04:18:57.10 3.0 undecidable manual Sn -2 0
IV.MNTT.EHZ. 2020-05-20T04:18:32.08 3.0 undecidable manual Sn 0.28 0
IV.ROSPO.HHZ. 2020-05-20T04:18:23.11 3.0 undecidable manual Pn 0.59 0
ST.GAGG.HHZ. 2020-05-20T04:18:23.10 3.0 undecidable manual Pn 0.8 0
IV.SENI.EHZ. 2020-05-20T04:18:06.92 3.0 undecidable manual Pg 2.34 0
IV.CELB.HHZ. 2020-05-20T04:17:59.91 0.1 undecidable manual S 239 0.7491 50 -0.3 83
IV.CELB.HHZ. 2020-05-20T04:17:50.41 0.1 undecidable manual P 239 0.7491 50 0.9 67
IV.MAON.HHZ. 2020-05-20T04:17:49.56 0.1 undecidable manual P 177 0.7105 50 0.72 73
IV.CASP.HHZ. 2020-05-20T04:17:48.48 0.3 undecidable manual S 205 0.3822 50 -0.86 56
IV.ARCI.HHZ. 2020-05-20T04:17:48.92 0.6 undecidable manual S 135 0.4047 50 -1.08 33
TV.SF01.EHZ. 2020-05-20T04:17:45.01 1.0 undecidable manual P 133 0.4784 50 0.13 23
TV.SF04.EHZ. 2020-05-20T04:17:45.71 0.3 negative manual P 125 0.5189 50 0.14 67
IV.CASP.HHZ. 2020-05-20T04:17:43.24 0.6 negative manual P 205 0.3822 50 0.01 47
IV.ARCI.HHZ. 2020-05-20T04:17:43.71 1.0 undecidable manual P 135 0.4047 50 0.09 23
IV.RIBO.EHZ.01 2020-05-20T04:17:42.69 0.3 undecidable manual S 188 0.1907 111 -0.07 73
IV.TRIF.CHZ. 2020-05-20T04:17:40.41 0.3 undecidable manual S 260 0.134 118 -0.36 69
IV.RIBO.EHZ.01 2020-05-20T04:17:39.70 0.1 positive manual P 188 0.1907 111 0.26 93
IV.TRIF.CHZ. 2020-05-20T04:17:38.38 0.1 negative manual P 260 0.134 118 0.09 98
IV.FROS.CHZ. 2020-05-20T04:17:38.94 0.3 undecidable manual S 36 0.089 129 -0.38 70
IV.FROS.CHZ. 2020-05-20T04:17:37.48 0.1 positive manual P 36 0.089 129 0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:2.5 0.004110848 0.112 AML other m 2020-05-20T04:17:39.32
IV.FROS.CHN. ML:2.3 0.002995521 0.128 AML other m 2020-05-20T04:17:39.20
IV.TRIF.CHE. ML:2.4 0.0023469615 0.1184 AML other m 2020-05-20T04:17:40.63
IV.TRIF.CHN. ML:2.4 0.002691479 0.1056 AML other m 2020-05-20T04:17:40.53
IV.RIBO.EHE.01 ML:1.6 0.000287495 0.1408 AML other m 2020-05-20T04:17:43.21
IV.CASP.HHN. ML:1.8 0.00023193025 0.08 AML other m 2020-05-20T04:17:48.84
IV.CASP.HHE. ML:2.1 0.00037744295 0.1184 AML other m 2020-05-20T04:17:48.64
IV.ARCI.HNN. ML:1.9 0.00023756 2.6592 AML other m 2020-05-20T04:17:47.80
IV.ARCI.HHE. ML:1.7 0.00014470015 0.16 AML other m 2020-05-20T04:17:50.05
IV.ARCI.HHN. ML:1.6 0.00011920165 0.2816 AML other m 2020-05-20T04:17:50.03
IV.ARCI.HNE. ML:1.8 0.000184058875 0.6176 AML other m 2020-05-20T04:17:49.97
TV.SF01.EHE. ML:1.5 7.211918E-5 0.1792 AML other m 2020-05-20T04:17:54.37
TV.SF01.EHN. ML:1.5 7.7529325E-5 0.32 AML other m 2020-05-20T04:17:52.87
TV.SF04.EHE. ML:1.6 9.102105E-5 0.1792 AML other m 2020-05-20T04:17:55.90
TV.SF04.EHN. ML:1.8 0.00014275355 0.2208 AML other m 2020-05-20T04:17:55.11
IV.MAON.HNN. ML:2.1 0.00017842586 2.1312 AML other m 2020-05-20T04:17:59.00
IV.MAON.HHE. ML:1.7 6.2802425E-5 1.0624 AML other m 2020-05-20T04:18:05.10
IV.MAON.HHN. ML:1.6 5.4296665E-5 1.0208 AML other m 2020-05-20T04:18:02.36
IV.MAON.HNE. ML:2.2 0.0002488314 1.9776 AML other m 2020-05-20T04:17:58.93
IV.CELB.HHN. ML:2 0.000118858735 0.4608 AML other m 2020-05-20T04:18:02.30
IV.CELB.HHE. ML:2 0.00013832945 0.08 AML other m 2020-05-20T04:18:02.49
ST.GAGG.HNN. ML:3 9.843339E-5 3.5392 AML other m 2020-05-20T04:19:14.42
ST.GAGG.HHE. ML:2.6 3.5703325E-5 0.9408 AML other m 2020-05-20T04:19:27.37
ST.GAGG.HHN. ML:2.6 3.9744345E-5 1.0016 AML other m 2020-05-20T04:19:26.10
ST.GAGG.HNE. ML:3.1 0.00012293429 3.9392 AML other m 2020-05-20T04:19:12.22
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