Earthquake with magnitude of ML 1.6 on date 15-10-2020 and time 22:18:53 (Italy) in region 2 km SE Poggibonsi (SI)

A magnitude ML 1.6 earthquake occured in region: 2 km SE Poggibonsi (SI), on

  • 15-10-2020 20:18:53 (UTC)
  • 15-10-2020 22:18:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.46, 11.16 at 11 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
Poggibonsi SI 2 29196 29196
Colle di Val d'Elsa SI 5 21620 50816
Monteriggioni SI 8 9810 60626
Barberino Val d'Elsa FI 10 4386 65012
San Gimignano SI 10 7820 72832
Castellina in Chianti SI 10 2859 75691
Tavarnelle Val di Pesa FI 12 7800 83491
Certaldo FI 14 16121 99612
Casole d'Elsa SI 16 3897 103509
Radda in Chianti SI 17 1613 105122
Greve in Chianti FI 19 13862 118984
Gambassi Terme FI 19 4870 123854

Municipalities with at least 50000 inhabitants

An earthquake occurred to
20 Km NW of Siena (53903 inhabitants)
34 Km S of Scandicci (50609 inhabitants)
36 Km S of Firenze (382808 inhabitants)
48 Km S of Prato (191150 inhabitants)
57 Km SE of Pistoia (90315 inhabitants)
58 Km W of Arezzo (99543 inhabitants)
68 Km E of Pisa (89158 inhabitants)
69 Km SE of Lucca (89046 inhabitants)
70 Km E of Livorno (159219 inhabitants)
77 Km N of Grosseto (82087 inhabitants)
87 Km SE of Viareggio (62467 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 1.6 2020-10-15
20:18:53
43.46 11.16 11 2020-10-15
20:52:23
Sala Sismica INGV-Roma 83811031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-15 20:18:53 ± 0.11
Latitude 43.46 ± 0.01
Longitude 11.16 ± 0.02
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83811031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1411
Semi-minor axis of confidence ellipse (meter) 588
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 80
Circular confidence region, given by single value of horizontal uncertainty (meter) 1410
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 15
Number of defining phases 12
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
Epicentral distance of station farthest from the epicenter (degree) 0.5333
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 83811031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-15 20:52:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RIBO.EHZ.01 2020-10-15T20:19:11.65 3.0 undecidable manual S 0
IV.PII.HHZ. 2020-10-15T20:19:11.70 0.6 undecidable manual S 300 0.5333 50 0.13 45
IV.MAGO.CHE. 2020-10-15T20:19:07.41 0.3 undecidable manual S 244 0.4101 50 -0.51 64
IV.TRIF.CHN. 2020-10-15T20:19:07.11 0.6 undecidable manual S 209 0.3903 50 -0.21 46
IV.CRMI.HHE. 2020-10-15T20:19:06.45 0.3 undecidable manual S 339 0.3651 50 -0.13 70
IV.APEC.HHZ. 2020-10-15T20:19:06.91 3.0 negative manual P 0.01 0
IV.RIBO.EHZ.01 2020-10-15T20:19:04.77 3.0 undecidable manual P 0
IV.PII.HHZ. 2020-10-15T20:19:03.83 0.1 negative manual P 300 0.5333 50 -0.02 92
IV.MAGO.CHE. 2020-10-15T20:19:02.27 0.3 undecidable manual P 244 0.4101 50 0.54 63
IV.FROS.CHZ. 2020-10-15T20:19:02.91 0.3 undecidable manual S 181 0.2455 50 -0.14 72
IV.CRMI.HHE. 2020-10-15T20:19:01.01 0.3 undecidable manual P 339 0.3651 50 0.05 71
IV.TRIF.CHN. 2020-10-15T20:19:01.48 0.3 undecidable manual P 209 0.3903 50 0.09 70
IV.FROS.CHZ. 2020-10-15T20:18:59.18 0.1 positive manual P 181 0.2455 50 0.26 93
IV.CSNT.HHZ. 2020-10-15T20:18:58.30 0.3 undecidable manual S 79 0.0935 137 -0.24 72
IV.CSNT.HHZ. 2020-10-15T20:18:56.37 0.1 negative manual P 79 0.0935 137 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.3 0.00026124935 0.0896 AML other m 2020-10-15T20:18:58.68
IV.CSNT.HHN. ML:1.5 0.0003792551 0.3968 AML other m 2020-10-15T20:18:58.66
IV.FROS.CHE. ML:1.8 0.0003660489 0.2304 AML other m 2020-10-15T20:19:03.05
IV.FROS.CHN. ML:1.7 0.0002583943 0.3456 AML other m 2020-10-15T20:19:03.95
IV.PII.HHE. ML:1.5 6.370715E-5 1.7664 AML other m 2020-10-15T20:19:19.40
IV.PII.HHN. ML:1.6 8.4885435E-5 0.3584 AML other m 2020-10-15T20:19:12.97
IV.RIBO.EHE.01 ML:1.8 0.0001376151 2.1376 AML other m 2020-10-15T20:19:13.42
IV.APEC.HNN. ML:3 0.0010702114 4.5952 AML other m 2020-10-15T20:19:31.32
IV.APEC.HHE. ML:1.9 7.9255775E-5 0.704 AML other m 2020-10-15T20:19:28.83
IV.APEC.HHN. ML:2 8.454324E-5 2.4832 AML other m 2020-10-15T20:19:17.26
IV.APEC.HNE. ML:2.9 0.000764116 2.368 AML other m 2020-10-15T20:19:10.53
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