Earthquake with magnitude of Md 1.2 on date 23-08-2019 and time 02:32:11 (Italy) in region 2 km SE Piancastagnaio (SI)

A magnitude Md 1.2 earthquake occured in region: 2 km SE Piancastagnaio (SI), on

  • 23-08-2019 00:32:11 (UTC)
  • 23-08-2019 02:32:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.84, 11.71 at 7 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
Piancastagnaio SI 2 4230 4230
Abbadia San Salvatore SI 6 6444 10674
Castell'Azzara GR 7 1476 12150
Radicofani SI 9 1097 13247
Santa Fiora GR 10 2622 15869
Proceno VT 13 557 16426
Arcidosso GR 14 4285 20711
San Casciano dei Bagni SI 15 1632 22343
Castel del Piano GR 15 4690 27033
Seggiano GR 16 961 27994
Acquapendente VT 16 5506 33500
Roccalbegna GR 17 1044 34544
Sorano GR 17 3428 37972
Semproniano GR 18 1059 39031
Onano VT 18 995 40026

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km E of Grosseto (82087 inhabitants)
57 Km NW of Viterbo (67173 inhabitants)
62 Km SE of Siena (53903 inhabitants)
63 Km W of Perugia (166134 inhabitants)
72 Km S of Arezzo (99543 inhabitants)
82 Km W of Foligno (57155 inhabitants)
83 Km W of Terni (111501 inhabitants)
83 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 Md 1.2 2019-08-23
00:32:11
42.84 11.71 7 2019-08-23
00:42:13
Sala Sismica INGV-Roma 71720151
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-23 00:32:11 ± 0.2
Latitude 42.84 ± 0.01
Longitude 11.71 ± 0.01
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 71720151

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 715
Semi-minor axis of confidence ellipse (meter) 342
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 185
Circular confidence region, given by single value of horizontal uncertainty (meter) 710
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 174
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.03327
Epicentral distance of station farthest from the epicenter (degree) 0.23292
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 3
Type of magnitude Md
Reference to an origin 71720151
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-23 00:42:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LATE.HHZ. 2019-08-23T00:32:20.92 0.6 undecidable manual S 162 0.2329 106 -0.17 47
IV.SACS.HHZ. 2019-08-23T00:32:18.41 0.6 undecidable manual S 85 0.1493 114 0.34 46
IV.LATE.HHZ. 2019-08-23T00:32:17.06 0.3 undecidable manual P 162 0.2329 106 -0.1 71
TV.SF01.EHZ. 2019-08-23T00:32:16.52 0.3 undecidable manual S 258 0.107 121 -0.11 73
IV.SACS.HHZ. 2019-08-23T00:32:15.12 0.3 undecidable manual P 85 0.1493 114 -0.3 69
IV.MCIV.CHZ. 2019-08-23T00:32:15.30 0.3 undecidable manual S 201 0.0603 137 0.09 73
TV.SF01.EHZ. 2019-08-23T00:32:14.75 0.1 undecidable manual P 258 0.107 121 0.17 95
TV.SF04.EHZ. 2019-08-23T00:32:14.44 0.3 undecidable manual S 271 0.0333 153 -0.17 73
TV.SF04.EHZ. 2019-08-23T00:32:13.41 0.1 undecidable manual P 271 0.0333 153 -0.01 100
IV.MCIV.CHZ. 2019-08-23T00:32:13.97 0.1 undecidable manual P 201 0.0603 137 0.2 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHZ. Md:1.1 9 END duration s
IV.MCIV.CHZ. Md:1.3 12 END duration s
TV.SF01.EHZ. Md:1.3 11 END duration s
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