Earthquake with magnitude of ML 1.4 on date 11-04-2020 and time 11:01:35 (Italy) in region 2 km SW Asciano (SI)

A magnitude ML 1.4 earthquake occured in region: 2 km SW Asciano (SI), on

  • 11-04-2020 09:01:35 (UTC)
  • 11-04-2020 11:01:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.23, 11.54 at 1 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
Asciano SI 2 7118 7118
Rapolano Terme SI 9 5249 12367
San Giovanni d'Asso SI 9 853 13220
Monteroni d'Arbia SI 9 9088 22308
Buonconvento SI 11 3173 25481
Trequanda SI 11 1254 26735
Murlo SI 13 2389 29124
Castelnuovo Berardenga SI 14 9097 38221
Sinalunga SI 16 12764 50985
Lucignano AR 18 3581 54566
Montalcino SI 19 5093 59659
San Quirico d'Orcia SI 19 2662 62321
Monte San Savino AR 19 8743 71064
Siena SI 20 53903 124967

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km SE of Siena (53903 inhabitants)
39 Km SW of Arezzo (99543 inhabitants)
62 Km NE of Grosseto (82087 inhabitants)
65 Km SE of Firenze (382808 inhabitants)
66 Km SE of Scandicci (50609 inhabitants)
70 Km W of Perugia (166134 inhabitants)
81 Km SE of Prato (191150 inhabitants)
93 Km SE of Pistoia (90315 inhabitants)
99 Km W of Foligno (57155 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
Reviewed
Rev100
ML 1.4 2020-04-11
09:01:35
43.23 11.54 1 2020-04-11
09:14:28
Sala Sismica INGV-Roma 78102511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-11 09:01:35 ± 0.1
Latitude 43.23 ± 0.00
Longitude 11.54 ± 0.01
Depth (km) 1 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 78102511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 599
Semi-minor axis of confidence ellipse (meter) 130
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 85
Circular confidence region, given by single value of horizontal uncertainty (meter) 600
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.6601
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 78102511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-11 09:14:28
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CGL.BHZ. 2020-04-11T09:03:33.14 3.0 undecidable manual Sn 2.64 0
IV.ACATE.EHZ. 2020-04-11T09:03:17.68 3.0 undecidable manual Pn 4.21 0
IV.MCRV.HHZ. 2020-04-11T09:03:14.58 3.0 undecidable manual Sn -2.63 0
MN.TRI.HHZ. 2020-04-11T09:03:08.16 3.0 undecidable manual Sg 8.74 0
IV.SGG.HHZ. 2020-04-11T09:03:03.78 3.0 undecidable manual Sg 7.29 0
IV.ERC.EHZ. 2020-04-11T09:02:54.80 3.0 undecidable manual Pn -0.03 0
IV.EUCT.HNZ. 2020-04-11T09:02:51.17 3.0 undecidable manual Sn 0.27 0
IV.CTL8.HNZ. 2020-04-11T09:02:15.53 3.0 negative manual Pn 0.21 0
IV.PE3.EHZ. 2020-04-11T09:02:08.00 3.0 undecidable manual S 1.44 0
IV.FIU.EHZ. 2020-04-11T09:02:00.74 3.0 negative manual P -0.97 0
IV.CASP.HHZ. 2020-04-11T09:02:00.01 0.6 undecidable manual S 229 0.6574 50 -0.12 47
IV.RINC.. 2020-04-11T09:01:58.00 3.0 undecidable manual S 0
IV.SF14.. 2020-04-11T09:01:52.52 3.0 undecidable manual S 0
IV.ARCI.HHZ. 2020-04-11T09:01:50.72 0.6 undecidable manual S 187 0.3768 92 0.19 49
TV.SF04.EHZ. 2020-04-11T09:01:50.60 0.6 undecidable manual S 167 0.4011 91 -0.83 42
IV.CASP.HHZ. 2020-04-11T09:01:50.01 0.1 undecidable manual P 229 0.6574 50 0.08 96
IV.SF01.. 2020-04-11T09:01:50.74 3.0 undecidable manual S 0
IV.RINC.. 2020-04-11T09:01:50.20 3.0 undecidable manual P 0
IV.PARC.HHZ. 2020-04-11T09:01:49.91 0.1 undecidable manual P 50 0.6601 50 -0.08 97
TV.SF11.HHN. 2020-04-11T09:01:49.80 0.6 undecidable manual S 164 0.3723 92 -0.53 47
IV.SSP9.EHZ. 2020-04-11T09:01:48.22 0.1 undecidable manual P 51 0.5531 50 0.07 97
IV.CRE.HHZ. 2020-04-11T09:01:47.04 0.1 undecidable manual P 37 0.4937 91 0.06 99
IV.SACS.HHZ. 2020-04-11T09:01:47.50 3.0 negative manual P 0.82 0
IV.CSNT.HHZ. 2020-04-11T09:01:47.24 0.6 undecidable manual S 324 0.3058 92 -0.52 46
IV.FROS.CHZ. 2020-04-11T09:01:46.73 0.6 undecidable manual S 267 0.2788 92 -0.01 52
IV.SF14.HHZ. 2020-04-11T09:01:46.39 3.0 undecidable manual P 0
IV.MCIV.CHZ. 2020-04-11T09:01:46.08 0.1 undecidable manual P 167 0.4587 91 -0.12 100
TV.SF04.EHZ. 2020-04-11T09:01:45.30 0.1 undecidable manual P 167 0.4011 91 0.39 94
IV.SF01.EHZ. 2020-04-11T09:01:45.27 3.0 undecidable manual P 0
IV.RIBO.EHZ.01 2020-04-11T09:01:45.86 0.1 undecidable manual P 232 0.4533 91 -0.23 97
TV.SF11.HHN. 2020-04-11T09:01:44.58 0.1 undecidable manual P 164 0.3723 92 0.31 96
IV.ARCI.HHZ. 2020-04-11T09:01:44.50 0.6 positive manual P 187 0.3768 92 0.11 50
IV.CSNT.HHZ. 2020-04-11T09:01:42.64 0.3 positive manual P 324 0.3058 92 -0.15 76
IV.FROS.CHZ. 2020-04-11T09:01:42.61 0.1 undecidable manual P 267 0.2788 92 0.41 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:2 0.0004605 1.62 AML other m 2020-04-11T09:01:47.12
IV.CSNT.HHE. ML:1.4 9.97E-5 0.18 AML other m 2020-04-11T09:01:47.51
IV.FROS.CHN. ML:1.9 0.0003585 0.76 AML other m 2020-04-11T09:01:47.28
IV.CSNT.HHN. ML:1.4 0.00010535 0.32 AML other m 2020-04-11T09:01:47.59
TV.SF04.EHN. ML:1.7 0.0001675 0.76 AML other m 2020-04-11T09:01:51.40
IV.CASP.HHN. ML:1.3 3.075E-5 0.7 AML other m 2020-04-11T09:01:51.43
IV.CASP.HHE. ML:1.1 2.175E-5 0.72 AML other m 2020-04-11T09:01:51.43
IV.ARCI.HHE. ML:1.5 9.96E-5 0.18 AML other m 2020-04-11T09:01:52.47
IV.ARCI.HHN. ML:1.4 8.895E-5 0.26 AML other m 2020-04-11T09:01:52.81
TV.SF04.EHE. ML:1.6 0.0001313 0.26 AML other m 2020-04-11T09:01:53.47
IV.SACS.HHE. ML:0.9 1.905E-5 0.92 AML other m 2020-04-11T09:01:57.16
IV.SACS.HHN. ML:0.9 1.84E-5 0.6 AML other m 2020-04-11T09:01:57.26
IV.CRE.HHN. ML:1.6 8.595E-5 0.38 AML other m 2020-04-11T09:01:58.26
IV.CRE.HHE. ML:1.3 4.7E-5 0.22 AML other m 2020-04-11T09:01:58.55
IV.PARC.HHN. ML:1.5 5.165E-5 0.94 AML other m 2020-04-11T09:02:02.50
IV.RINC.HHE. ML:1.5 5.18E-5 0.76 AML other m 2020-04-11T09:02:03.53
IV.RINC.HHN. ML:1.4 4.03E-5 0.54 AML other m 2020-04-11T09:02:03.42
IV.PARC.HHE. ML:1.4 4.715E-5 1.62 AML other m 2020-04-11T09:02:04.01
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