Earthquake with magnitude of ML 1.8 on date 20-05-2020 and time 06:35:03 (Italy) in region 3 km SE Chiusdino (SI)

A magnitude ML 1.8 earthquake occured in region: 3 km SE Chiusdino (SI), on

  • 20-05-2020 04:35:03 (UTC)
  • 20-05-2020 06:35:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.14, 11.1 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 3 1903 1903
Monticiano SI 6 1571 3474
Montieri GR 7 1204 4678
Roccastrada GR 15 9199 13877
Radicondoli SI 15 914 14791
Castelnuovo di Val di Cecina PI 18 2231 17022
Sovicille SI 19 10116 27138
Massa Marittima GR 20 8375 35513

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 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)
73 Km SW of Arezzo (99543 inhabitants)
79 Km SE of Livorno (159219 inhabitants)
83 Km S of Prato (191150 inhabitants)
86 Km SE of Pisa (89158 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
93 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
04:35:03
43.14 11.11 8 2020-05-20
04:47:35
Sala Sismica INGV-Roma 79353571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-05-20 04:35:03 ± 0.19
Latitude 43.14 ± 0.01
Longitude 11.11 ± 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 79353571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1517
Semi-minor axis of confidence ellipse (meter) 1059
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 329
Circular confidence region, given by single value of horizontal uncertainty (meter) 1520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 125
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.46
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.76173
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 23
Type of magnitude ML
Reference to an origin 79353571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-05-20 04:47:35
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.USI.HHZ. 2020-05-20T04:36:14.89 3.0 undecidable manual Pn 0.03 0
IV.GIUL.HHZ. 2020-05-20T04:36:12.73 3.0 undecidable manual Sn 2.48 0
IV.MELA.HHZ. 2020-05-20T04:36:08.23 3.0 undecidable manual Pg 12.43 0
IV.CIMA.HNZ. 2020-05-20T04:36:00.98 3.0 undecidable manual Sn -0.39 0
IV.MURB.HHZ. 2020-05-20T04:35:42.87 3.0 undecidable manual S 1.95 0
IV.ARVD.HHZ. 2020-05-20T04:35:29.99 3.0 negative manual P 0.58 0
IV.CELB.HHZ. 2020-05-20T04:35:29.04 0.6 undecidable manual S 240 0.7617 50 -0.53 40
TV.SF04.EHZ. 2020-05-20T04:35:21.18 0.6 undecidable manual S 126 0.5045 50 -0.78 38
TV.SF01.EHZ. 2020-05-20T04:35:20.14 0.3 undecidable manual S 134 0.4658 50 -0.67 61
IV.CELB.HHZ. 2020-05-20T04:35:19.67 0.6 negative manual P 240 0.7617 50 0.93 34
IV.MAON.HHZ. 2020-05-20T04:35:18.66 0.1 undecidable manual P 178 0.7078 50 0.84 71
IV.ARCI.HHZ. 2020-05-20T04:35:17.99 0.3 undecidable manual S 136 0.3921 50 -0.63 62
IV.FIR.HHZ. 2020-05-20T04:35:16.31 3.0 undecidable manual P -0.73 0
TV.SF01.EHZ. 2020-05-20T04:35:14.03 0.1 undecidable manual P 134 0.4658 50 0.35 89
TV.SF04.EHZ. 2020-05-20T04:35:14.82 0.3 undecidable manual P 126 0.5045 50 0.47 65
IV.ARCI.HHZ. 2020-05-20T04:35:12.67 0.6 negative manual P 136 0.3921 50 0.25 46
IV.RIBO.EHZ.01 2020-05-20T04:35:11.81 0.6 undecidable manual S 193 0.1925 111 -0.08 50
IV.TRIF.CHZ. 2020-05-20T04:35:09.49 0.6 undecidable manual S 262 0.1493 117 -0.9 39
IV.RIBO.EHZ.01 2020-05-20T04:35:08.80 0.1 positive manual P 193 0.1925 111 0.27 96
IV.TRIF.CHZ. 2020-05-20T04:35:07.48 0.1 negative manual P 262 0.1493 117 -0.19 98
IV.FROS.CHZ. 2020-05-20T04:35:07.98 0.3 undecidable manual S 27 0.0818 133 -0.26 74
IV.FROS.CHZ. 2020-05-20T04:35:06.59 0.1 positive manual P 27 0.0818 133 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:2.4 0.003359768 0.112 AML other m 2020-05-20T04:35:08.43
IV.FROS.CHN. ML:2.2 0.00234083 0.1184 AML other m 2020-05-20T04:35:08.31
IV.TRIF.CHE. ML:2.3 0.001710529 0.112 AML other m 2020-05-20T04:35:09.74
IV.TRIF.CHN. ML:2.3 0.0019774645 0.1024 AML other m 2020-05-20T04:35:09.63
IV.RIBO.EHE.01 ML:1.6 0.0002986457 0.16 AML other m 2020-05-20T04:35:12.14
IV.ARCI.HHN. ML:1.4 8.3267745E-5 0.2592 AML other m 2020-05-20T04:35:18.18
IV.ARCI.HNE. ML:1.6 0.0001420309 0.8896 AML other m 2020-05-20T04:35:26.59
IV.ARCI.HNN. ML:1.8 0.00017386055 0.9216 AML other m 2020-05-20T04:35:24.98
IV.ARCI.HHE. ML:1.5 0.000106878865 0.16 AML other m 2020-05-20T04:35:19.07
TV.SF01.EHE. ML:1.4 7.1091335E-5 0.3392 AML other m 2020-05-20T04:35:21.82
TV.SF01.EHN. ML:1.4 7.081208E-5 0.3584 AML other m 2020-05-20T04:35:22.00
TV.SF04.EHE. ML:1.6 8.8861785E-5 0.24 AML other m 2020-05-20T04:35:23.42
TV.SF04.EHN. ML:1.7 0.000114319205 0.2208 AML other m 2020-05-20T04:35:24.11
IV.FIR.HHN. ML:2.3 0.0003147726 0.1024 AML other m 2020-05-20T04:35:19.36
IV.FIR.HNE. ML:2.2 0.0002690055 0.0896 AML other m 2020-05-20T04:35:18.93
IV.FIR.HNN. ML:2.3 0.00029326595 0.0896 AML other m 2020-05-20T04:35:19.36
IV.FIR.HHE. ML:2.3 0.0002991028 0.0992 AML other m 2020-05-20T04:35:18.93
IV.MAON.HNN. ML:1.9 0.00011676795 0.4288 AML other m 2020-05-20T04:35:21.02
IV.MAON.HHE. ML:1.6 5.304425E-5 0.88 AML other m 2020-05-20T04:35:35.47
IV.MAON.HHN. ML:1.5 4.393529E-5 0.9024 AML other m 2020-05-20T04:35:49.89
IV.MAON.HNE. ML:2 0.000129287205 0.8704 AML other m 2020-05-20T04:35:25.95
IV.CELB.HHN. ML:1.6 4.892048E-5 0.0768 AML other m 2020-05-20T04:35:31.54
IV.CELB.HHE. ML:1.9 0.00010409649 0.0608 AML other m 2020-05-20T04:35:31.63
IV.ARVD.HHN. ML:1.9 4.098987E-5 1.5392 AML other m 2020-05-20T04:36:06.31
IV.ARVD.HHE. ML:1.9 3.9191355E-5 1.28 AML other m 2020-05-20T04:35:50.69
IV.USI.HHE. ML:3.9 0.000194507 0.8608 AML other m 2020-05-20T04:36:16.45
IV.USI.HHN. ML:4.3 0.0005088703 1.0208 AML other m 2020-05-20T04:36:44.47
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