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, 11.09 at 8 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 7 1571 4678
Radicondoli SI 14 914 5592
Roccastrada GR 15 9199 14791
Castelnuovo di Val di Cecina PI 17 2231 17022
Monterotondo Marittimo GR 19 1371 18393
Massa Marittima GR 19 8375 26768
Sovicille SI 20 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)
72 Km S of Firenze (382808 inhabitants)
74 Km SW 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 1.8 2020-05-20
04:17:34
43.14 11.09 8 2020-11-19
12:36:56
Bollettino Sismico Italiano INGV 81670731
Reviewed
Rev100
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 ± 0.1
Latitude 43.14 ± 0.01
Longitude 11.09 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 81670731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 682
Semi-minor axis of confidence ellipse (meter) 580
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 307
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) 71
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.99015
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 18
Magnitudes 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

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 81670731
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-08-05 09:50:01
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
ST.GAGG.HHZ. 2020-05-20T04:18:23.10 3.0 undecidable manual Pn 0.8 0
IV.ROSPO.HHZ. 2020-05-20T04:18:23.11 3.0 undecidable manual Pn 0.59 0
IV.SENI.EHZ. 2020-05-20T04:18:06.92 3.0 undecidable manual Pg 2.34 0
IV.BDI.HNZ. 2020-05-20T04:17:53.69 0.3 undecidable manual P 339 0.9902 50 0.11 63
GU.MAIM.HHZ. 2020-05-20T04:17:51.87 0.3 undecidable manual P 331 0.8885 50 0.04 65
IV.MPPT.EHN. 2020-05-20T04:17:50.72 0.3 undecidable manual P 0 0.8184 50 0.08 66
IV.CELB.HHZ. 2020-05-20T04:17:50.29 0.6 undecidable manual P 239 0.7527 50 0.77 37
IV.ATMC.EHE. 2020-05-20T04:17:50.47 0.6 undecidable manual P 69 0.8598 50 -0.87 34
IV.MAON.HHZ. 2020-05-20T04:17:49.50 0.3 undecidable manual P 178 0.7105 50 0.71 57
IV.CASP.HHZ. 2020-05-20T04:17:48.52 0.3 undecidable manual S 205 0.384 50 -0.85 57
IV.ARCI.HHZ. 2020-05-20T04:17:48.97 0.3 undecidable manual S 135 0.402 50 -0.92 55
IV.MCIV.CHE. 2020-05-20T04:17:46.41 0.3 undecidable manual P 130 0.5603 50 0.2 68
TV.SF14.HHN. 2020-05-20T04:17:46.06 0.3 undecidable manual P 135 0.5423 50 0.14 69
TV.SF03.EHN. 2020-05-20T04:17:46.24 0.3 undecidable manual P 127 0.5495 50 0.2 68
TV.SF11.HHZ. 2020-05-20T04:17:45.21 0.6 undecidable manual P 122 0.5081 50 -0.12 47
TV.SF04.EHZ. 2020-05-20T04:17:45.66 0.3 undecidable manual P 126 0.5153 50 0.21 68
TV.SF13.HHN. 2020-05-20T04:17:45.03 0.6 undecidable manual P 129 0.5018 50 -0.2 46
TV.SF01.EHZ. 2020-05-20T04:17:44.98 0.3 undecidable manual P 133 0.4757 50 0.2 69
IV.ARCI.HHZ. 2020-05-20T04:17:43.71 0.6 undecidable manual P 135 0.402 50 0.2 47
IV.CASP.HHZ. 2020-05-20T04:17:43.24 0.3 negative manual P 205 0.384 50 0.03 73
IV.RIBO.EHZ.01 2020-05-20T04:17:42.69 0.3 undecidable manual S 190 0.1925 110 0.01 76
IV.TRIF.CHZ. 2020-05-20T04:17:40.30 0.3 undecidable manual S 260 0.1385 117 -0.49 69
IV.RIBO.EHZ.01 2020-05-20T04:17:39.66 0.3 undecidable manual P 190 0.1925 110 0.31 71
IV.TRIF.CHZ. 2020-05-20T04:17:38.36 0.3 undecidable manual P 260 0.1385 117 0.1 75
IV.FROS.CHZ. 2020-05-20T04:17:38.79 0.1 undecidable manual S 34 0.0863 129 -0.3 97
IV.FROS.CHZ. 2020-05-20T04:17:37.45 0.1 undecidable manual P 34 0.0863 129 0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:2.4 0.004110848 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.CHN. ML:2.4 0.002691479 0.1056 AML other m 2020-05-20T04:17:40.53
IV.TRIF.CHE. ML:2.4 0.0023469615 0.1184 AML other m 2020-05-20T04:17:40.63
IV.RIBO.EHE.01 ML:1.6 0.000287495 0.1408 AML other m 2020-05-20T04:17:43.21
IV.CASP.HHE. ML:2.1 0.00037744295 0.1184 AML other m 2020-05-20T04:17:48.64
IV.CASP.HHN. ML:1.8 0.00023193025 0.08 AML other m 2020-05-20T04:17:48.84
IV.ARCI.HHN. ML:1.6 0.00011920165 0.2816 AML other m 2020-05-20T04:17:50.03
IV.ARCI.HNN. ML:1.8 0.00016871908 0.5984 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
TV.SF01.EHN. ML:1.5 7.7529325E-5 0.32 AML other m 2020-05-20T04:17:52.87
TV.SF01.EHE. ML:1.5 7.211918E-5 0.1792 AML other m 2020-05-20T04:17:54.37
TV.SF04.EHN. ML:1.8 0.00014275355 0.2208 AML other m 2020-05-20T04:17:55.11
TV.SF04.EHE. ML:1.6 9.102105E-5 0.1792 AML other m 2020-05-20T04:17:55.90
IV.CELB.HHE. ML:2 0.00013832945 0.08 AML other m 2020-05-20T04:18:02.49
IV.CELB.HHN. ML:1.7 6.516093E-5 0.0576 AML other m 2020-05-20T04:18:02.40
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