Earthquake with magnitude of ML 1.6 on date 31-08-2019 and time 20:56:37 (UTC) in region 1 km S Radicofani (SI)

A magnitude ML 1.6 earthquake occured in region: 1 km S Radicofani (SI), on

  • 31-08-2019 20:56:37 (UTC)
  • 31-08-2019 22:56:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.89, 11.76 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
Radicofani SI 1 1097 1097
Abbadia San Salvatore SI 7 6444 7541
Piancastagnaio SI 7 4230 11771
San Casciano dei Bagni SI 9 1632 13403
Castell'Azzara GR 14 1476 14879
Cetona SI 14 2755 17634
Sarteano SI 14 4717 22351
Proceno VT 15 557 22908
Santa Fiora GR 16 2622 25530
Seggiano GR 17 961 26491
Castiglione d'Orcia SI 18 2346 28837
Acquapendente VT 18 5506 34343
Castel del Piano GR 18 4690 39033
Arcidosso GR 18 4285 43318
Allerona TR 19 1794 45112
Chianciano Terme SI 20 7105 52217

Municipalities with at least 50000 inhabitants

An earthquake occurred to
55 Km E of Grosseto (82087 inhabitants)
56 Km W of Perugia (166134 inhabitants)
59 Km NW of Viterbo (67173 inhabitants)
59 Km SE of Siena (53903 inhabitants)
65 Km S of Arezzo (99543 inhabitants)
77 Km W of Foligno (57155 inhabitants)
81 Km W of Terni (111501 inhabitants)
88 Km N of Civitavecchia (52991 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 1.6 2019-08-31
20:56:37
42.89 11.76 8 2019-08-31
21:03:00
Sala Sismica INGV-Roma 71985151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-31 20:56:37 ± 0.1
Latitude 42.89 ± 0.01
Longitude 11.76 ± 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 71985151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 847
Semi-minor axis of confidence ellipse (meter) 438
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 176
Circular confidence region, given by single value of horizontal uncertainty (meter) 850
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 137
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 26
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
Epicentral distance of station farthest from the epicenter (degree) 0.5306
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 71985151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-31 21:03:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2019-08-31T20:57:02.11 3.0 undecidable manual S 0.28 0
IV.ATTE.HHZ. 2019-08-31T20:56:56.92 0.3 undecidable manual S 54 0.5306 50 0.3 68
IV.RIBO.EHZ.01 2019-08-31T20:56:55.89 0.3 undecidable manual S 277 0.5288 50 -0.7 60
IV.PARC.HHZ. 2019-08-31T20:56:54.71 3.0 positive manual P 0.29 0
IV.RIBO.EHZ.01 2019-08-31T20:56:49.35 1.0 positive manual P 277 0.5288 50 0.7 20
IV.ATTE.HHZ. 2019-08-31T20:56:48.59 0.6 undecidable manual P 54 0.5306 50 -0.08 47
IV.LATE.HHZ. 2019-08-31T20:56:48.22 0.6 undecidable manual S 174 0.2752 105 -0.58 44
IV.MGAB.HHZ. 2019-08-31T20:56:47.62 0.6 undecidable manual S 84 0.2554 106 -0.44 46
IV.ARCI.HHZ. 2019-08-31T20:56:46.11 0.6 undecidable manual S 260 0.2149 109 -0.45 47
TV.SF01.EHZ. 2019-08-31T20:56:44.72 0.6 undecidable manual S 243 0.1655 114 -0.08 51
IV.LATE.HHZ. 2019-08-31T20:56:44.32 0.1 positive manual P 174 0.2752 105 0.17 98
TV.SF14.HHE. 2019-08-31T20:56:44.43 0.6 undecidable manual S 220 0.1727 113 -0.6 45
IV.MGAB.HHZ. 2019-08-31T20:56:43.44 0.6 undecidable manual P 84 0.2554 106 -0.29 48
TV.SF13.HHE. 2019-08-31T20:56:43.55 0.3 undecidable manual S 237 0.1268 120 0.08 77
IV.ARCI.HHZ. 2019-08-31T20:56:43.13 0.1 positive manual P 260 0.2149 109 0.27 97
IV.MCIV.CHZ. 2019-08-31T20:56:43.70 0.6 undecidable manual S 211 0.1268 120 0.24 49
TV.SF04.EHZ. 2019-08-31T20:56:42.34 0.3 undecidable manual S 236 0.0926 129 -0.02 78
TV.SF01.EHZ. 2019-08-31T20:56:42.18 0.1 positive manual P 243 0.1655 114 0.33 96
IV.SACS.HHZ. 2019-08-31T20:56:42.83 0.6 undecidable manual S 110 0.1133 123 -0.19 50
TV.SF03.EHE. 2019-08-31T20:56:42.88 0.6 undecidable manual S 214 0.1025 126 0.2 50
IV.SACS.HHZ. 2019-08-31T20:56:41.08 1.0 positive manual P 110 0.1133 123 0.26 25
TV.SF14.HHE. 2019-08-31T20:56:41.76 0.1 undecidable manual P 220 0.1727 113 -0.22 99
TV.SF11.HHE. 2019-08-31T20:56:41.10 0.6 undecidable manual S 253 0.0657 138 -0.51 47
IV.MCIV.CHZ. 2019-08-31T20:56:41.28 0.1 positive manual P 211 0.1268 120 0.21 100
TV.SF13.HHE. 2019-08-31T20:56:41.31 0.1 undecidable manual P 237 0.1268 120 0.24 99
TV.SF03.EHE. 2019-08-31T20:56:40.90 0.1 undecidable manual P 214 0.1025 126 0.27 99
TV.SF04.EHZ. 2019-08-31T20:56:40.74 0.1 positive manual P 236 0.0926 129 0.3 98
TV.SF11.HHE. 2019-08-31T20:56:39.76 0.1 undecidable manual P 253 0.0657 138 -0.25 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCIV.CHN. ML:2 0.0010415 0.38 AML other m 2019-08-31T20:56:44.30
IV.MCIV.CHE. ML:1.8 0.000763 0.78 AML other m 2019-08-31T20:56:44.94
IV.SACS.HHE. ML:1.5 0.000389 0.54 AML other m 2019-08-31T20:56:45.71
TV.SF01.EHE. ML:1.8 0.0004925 0.26 AML other m 2019-08-31T20:56:45.31
TV.SF01.EHN. ML:1.8 0.000495 0.24 AML other m 2019-08-31T20:56:46.22
IV.SACS.HHN. ML:1.4 0.0002875 0.58 AML other m 2019-08-31T20:56:47.70
IV.ARCI.HHN. ML:1.3 0.0001265 0.26 AML other m 2019-08-31T20:56:47.44
IV.ARCI.HHE. ML:1.3 0.0001395 0.36 AML other m 2019-08-31T20:56:47.86
IV.MGAB.HHN. ML:1.6 0.0001825 0.16 AML other m 2019-08-31T20:56:49.10
IV.MGAB.HNN. ML:1.5 0.0001658 0.98 AML other m 2019-08-31T20:56:49.10
IV.MGAB.HHE. ML:1.5 0.000159 1.12 AML other m 2019-08-31T20:56:50.91
IV.MGAB.HNE. ML:1.4 0.0001419 0.38 AML other m 2019-08-31T20:56:51.91
IV.LATE.HHE. ML:1.6 0.000204 0.26 AML other m 2019-08-31T20:56:51.98
IV.LATE.HHN. ML:1.7 0.0002535 0.7 AML other m 2019-08-31T20:56:52.31
IV.ATTE.HHN. ML:1.7 0.00010545 0.24 AML other m 2019-08-31T20:56:58.30
IV.ATTE.HHE. ML:1.6 8.745E-5 0.28 AML other m 2019-08-31T20:56:58.19
IV.MURB.HHN. ML:2.2 0.000248 0.3 AML other m 2019-08-31T20:57:04.55
IV.MURB.HHE. ML:2.1 0.0002035 0.26 AML other m 2019-08-31T20:57:05.24
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