Earthquake with magnitude of ML 1.5 on date 21-01-2020 and time 21:38:24 (Italy) in region 1 km SE Abbadia San Salvatore (SI)

A magnitude ML 1.5 earthquake occured in region: 1 km SE Abbadia San Salvatore (SI), on

  • 21-01-2020 20:38:24 (UTC)
  • 21-01-2020 21:38:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.87, 11.68 at 2 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
Abbadia San Salvatore SI 1 6444 6444
Piancastagnaio SI 3 4230 10674
Radicofani SI 7 1097 11771
Santa Fiora GR 9 2622 14393
Castell'Azzara GR 11 1476 15869
Arcidosso GR 12 4285 20154
Seggiano GR 12 961 21115
Castel del Piano GR 12 4690 25805
Castiglione d'Orcia SI 16 2346 28151
San Casciano dei Bagni SI 16 1632 29783
Roccalbegna GR 17 1044 30827
Proceno VT 18 557 31384
Semproniano GR 20 1059 32443
Sarteano SI 20 4717 37160

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km E of Grosseto (82087 inhabitants)
57 Km SE of Siena (53903 inhabitants)
61 Km NW of Viterbo (67173 inhabitants)
63 Km W of Perugia (166134 inhabitants)
68 Km S of Arezzo (99543 inhabitants)
84 Km W of Foligno (57155 inhabitants)
86 Km W of Terni (111501 inhabitants)
87 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 1.5 2020-01-21
20:38:24
42.87 11.69 2 2020-01-21
20:56:49
Sala Sismica INGV-Roma 75706701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-21 20:38:24 ± 0.32
Latitude 42.87 ± 0.01
Longitude 11.69 ± 0.01
Depth (km) 2 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 75706701

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1630
Semi-minor axis of confidence ellipse (meter) 1160
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 343
Circular confidence region, given by single value of horizontal uncertainty (meter) 1630
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 224
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.16637
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 75706701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-21 20:56:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LAV9.HHZ. 2020-01-21T20:38:47.11 3.0 positive manual P 0.05 0
IV.FDMO.HHZ. 2020-01-21T20:38:41.48 3.0 undecidable manual P -0.09 0
IV.SACS.HHZ. 2020-01-21T20:38:28.42 0.3 undecidable manual P 99 0.1664 98 0.37 70
IV.MCIV.CHZ. 2020-01-21T20:38:28.05 0.3 undecidable manual S 184 0.0962 103 -0.06 76
TV.SF01.EHZ. 2020-01-21T20:38:28.72 0.1 undecidable manual S 235 0.1088 101 0.12 100
TV.SF03.EHZ. 2020-01-21T20:38:27.12 0.6 undecidable manual S 180 0.0719 107 -0.09 50
TV.SF01.EHZ. 2020-01-21T20:38:27.14 0.1 undecidable manual P 235 0.1088 101 0.35 95
IV.MCIV.CHZ. 2020-01-21T20:38:26.43 0.3 undecidable manual P 184 0.0962 103 -0.08 75
TV.SF04.EHZ. 2020-01-21T20:38:26.45 0.6 undecidable manual S 205 0.0423 117 0.28 49
TV.SF03.EHZ. 2020-01-21T20:38:26.12 0.1 undecidable manual P 180 0.0719 107 0.13 100
TV.SF14.HHZ. 2020-01-21T20:38:26.57 0.1 undecidable manual P 203 0.1295 100 -0.68 85
TV.SF04.EHZ. 2020-01-21T20:38:25.86 0.1 undecidable manual P 205 0.0423 117 0.47 94
TV.SF11.HHZ. 2020-01-21T20:38:24.47 0.3 undecidable manual S 217 0.0072 162 -0.74 64
TV.SF11.HHZ. 2020-01-21T20:38:23.84 1.0 undecidable manual P 217 0.0072 162 -0.99 19
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:0 0.0214 0.1 AML other m 2020-01-21T20:38:26.58
TV.SF04.EHE. ML:0 0.0118 0.08 AML other m 2020-01-21T20:38:26.66
TV.SF01.EHN. ML:1.5 0.0005395 0.2 AML other m 2020-01-21T20:38:28.83
TV.SF01.EHE. ML:1.6 0.0005489717 0.1792 AML other m 2020-01-21T20:38:28.96
IV.LATE.HHE. ML:1.3 0.000101829725 0.2816 AML other m 2020-01-21T20:38:34.82
IV.LATE.HHN. ML:1.4 0.000123303655 1.5232 AML other m 2020-01-21T20:38:33.86
IV.MCIV.CHE. ML:1.5 0.0005757513 0.256 AML other m 2020-01-21T20:38:29.29
IV.MCIV.CHN. ML:1.6 0.0007747518 0.1152 AML other m 2020-01-21T20:38:28.22
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