Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 12-04-2020 and time 01:09:13 (Italy) in region 3 km SE Colle di Val d'Elsa (SI)

A magnitude ML 1.0 earthquake occured in region: 3 km SE Colle di Val d'Elsa (SI), on

  • 11-04-2020 23:09:13 (UTC)
  • 12-04-2020 01:09:13 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4010, 11.1460 at 5 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Colle di Val d'Elsa SI 3 21620 21620
Monteriggioni SI 6 9810 31430
Poggibonsi SI 8 29196 60626
Casole d'Elsa SI 11 3897 64523
San Gimignano SI 11 7820 72343
Castellina in Chianti SI 14 2859 75202
Sovicille SI 15 10116 85318
Barberino Val d'Elsa FI 16 4386 89704
Radicondoli SI 18 914 90618
Siena SI 18 53903 144521
Tavarnelle Val di Pesa FI 18 7800 152321
Certaldo FI 19 16121 168442

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km NW of Siena (53903 inhabitants)
40 Km S of Scandicci (50609 inhabitants)
42 Km S of Firenze (382808 inhabitants)
54 Km S of Prato (191150 inhabitants)
60 Km W of Arezzo (99543 inhabitants)
62 Km SE of Pistoia (90315 inhabitants)
70 Km SE of Pisa (89158 inhabitants)
70 Km E of Livorno (159219 inhabitants)
71 Km N of Grosseto (82087 inhabitants)
72 Km SE of Lucca (89046 inhabitants)
89 Km SE of Viareggio (62467 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
Reviewed
Rev100 		ML 1.0 2020-04-11
23:09:13		 43.4008 11.1462 5 2020-04-11
23:18:40		 Sala Sismica INGV-Roma 78124261
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-11 23:09:13 ± 0.08
Latitude 43.4008 ± 0.0045
Longitude 11.1462 ± 0.0062
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 78124261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 551
Semi-minor axis of confidence ellipse (meter) 223
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 297
Circular confidence region, given by single value of horizontal uncertainty (meter) 550.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 102
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.12680
Epicentral distance of station farthest from the epicenter (degree) 0.73475
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 78124261
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-11 23:18:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SSP9.EHZ. 2020-04-11T23:09:39.71 0.6 undecidable manual S 76 81.5517 50 0.29 57
IV.PII.HHZ. 2020-04-11T23:09:33.73 0.6 undecidable manual S 306 61.2942 50 -0.29 59
IV.RUFI.EHZ. 2020-04-11T23:09:32.38 0.3 undecidable manual S 31 56.5989 50 -0.37 88
IV.CRMI.HNN. 2020-04-11T23:09:29.71 0.3 undecidable manual S 343 45.8208 96 -0.09 95
IV.SSP9.EHZ. 2020-04-11T23:09:28.75 0.3 undecidable manual P 76 81.5517 50 0.15 87
IV.MAGO.CHN. 2020-04-11T23:09:28.41 0.6 undecidable manual S 250 41.8248 97 -0.04 64
IV.TRIF.CHE. 2020-04-11T23:09:26.29 0.3 undecidable manual S 212 37.3293 98 -0.6 85
IV.PII.HHZ. 2020-04-11T23:09:25.99 0.3 undecidable manual P 306 61.2942 50 0.51 84
IV.RUFI.EHZ. 2020-04-11T23:09:24.52 0.3 undecidable manual P 31 56.5989 50 -0.22 90
IV.CRMI.HNN. 2020-04-11T23:09:23.20 0.3 undecidable manual P 343 45.8208 96 0.16 93
IV.MAGO.CHN. 2020-04-11T23:09:22.45 0.3 undecidable manual P 250 41.8248 97 0.19 93
IV.FROS.CHZ. 2020-04-11T23:09:21.26 0.3 undecidable manual S 178 21.2676 103 -0.12 98
IV.TRIF.CHE. 2020-04-11T23:09:21.68 0.6 undecidable manual P 212 37.3293 98 0.31 61
IV.CSNT.HHZ. 2020-04-11T23:09:18.82 0.3 undecidable manual S 55 14.0748 109 -0.18 98
IV.FROS.CHZ. 2020-04-11T23:09:18.48 0.3 undecidable manual P 178 21.2676 103 0.29 95
IV.CSNT.HHZ. 2020-04-11T23:09:16.91 0.3 undecidable manual P 55 14.0748 109 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.2 0.0001325 0.7 AML other m 2020-04-11T23:09:22.98
IV.CSNT.HHN. ML:0.8 0.0000703 1.54 AML other m 2020-04-11T23:09:19.91
IV.FROS.CHN. ML:1.3 0.0001421581 0.3584 AML other m 2020-04-11T23:09:23.59
IV.RUFI.EHE. ML:1.0 0.000022372025 0.5632 AML other m 2020-04-11T23:09:32.64
IV.RUFI.EHN. ML:0.8 0.000014482336500000002 0.3712 AML other m 2020-04-11T23:09:32.76
IV.PII.HHE. ML:1.1 0.000024531064999999997 0.4608 AML other m 2020-04-11T23:09:35.65
IV.PII.HHN. ML:1.1 0.000026858659999999998 0.2816 AML other m 2020-04-11T23:09:35.99
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