Earthquake with magnitude of ML 1.8 on date 08-07-2019 and time 22:39:57 (Italy) in region 3 km E Colle di Val d'Elsa (SI)

A magnitude ML 1.8 earthquake occured in region: 3 km E Colle di Val d'Elsa (SI), on

  • 08-07-2019 20:39:57 (UTC)
  • 08-07-2019 22:39:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.44, 11.16 at 9 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
Colle di Val d'Elsa SI 3 21620 21620
Poggibonsi SI 4 29196 50816
Monteriggioni SI 7 9810 60626
San Gimignano SI 10 7820 68446
Castellina in Chianti SI 11 2859 71305
Barberino Val d'Elsa FI 12 4386 75691
Casole d'Elsa SI 14 3897 79588
Tavarnelle Val di Pesa FI 14 7800 87388
Certaldo FI 16 16121 103509
Sovicille SI 18 10116 113625
Radda in Chianti SI 19 1613 115238
Siena SI 19 53903 169141
Gambassi Terme FI 20 4870 174011

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km NW of Siena (53903 inhabitants)
36 Km S of Scandicci (50609 inhabitants)
38 Km S of Firenze (382808 inhabitants)
50 Km S of Prato (191150 inhabitants)
59 Km SE of Pistoia (90315 inhabitants)
59 Km W of Arezzo (99543 inhabitants)
68 Km E of Pisa (89158 inhabitants)
70 Km E of Livorno (159219 inhabitants)
70 Km SE of Lucca (89046 inhabitants)
75 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
Rev 100 ML 1.8 2019-07-08
20:39:57
43.44 11.16 9 2019-07-08
20:53:51
Sala Sismica INGV-Roma 70384051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-07-08 20:39:57 ± 0.26
Latitude 43.44 ± 0.01
Longitude 11.16 ± 0.03
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 70384051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2649
Semi-minor axis of confidence ellipse (meter) 769
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 109
Circular confidence region, given by single value of horizontal uncertainty (meter) 2650
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 203
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.68528
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 70384051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-07-08 20:53:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IT.FIE.HGZ. 2019-07-08T20:40:57.82 3.0 undecidable manual Sg 6.82 0
IV.EUCT.HNZ. 2019-07-08T20:40:26.41 3.0 undecidable manual Pn -6.15 0
IV.RIBO.EHZ.01 2019-07-08T20:40:14.91 0.3 undecidable manual S 189 0.4928 50 -0.4 64
IV.RUFI.EHZ. 2019-07-08T20:40:14.65 0.3 undecidable manual S 32 0.4766 50 -0.18 67
IV.SFI.EHZ. 2019-07-08T20:40:11.67 0.1 undecidable manual P 47 0.6853 50 0.48 81
IV.RIBO.EHZ.01 2019-07-08T20:40:08.33 0.3 undecidable manual P 189 0.4928 50 0.43 64
IV.RUFI.EHZ. 2019-07-08T20:40:07.43 0.1 undecidable manual P 32 0.4766 50 -0.19 90
IV.PII.HHZ. 2019-07-08T20:40:07.60 3.0 positive manual Pn -1.64 0
IV.CSNT.HHZ. 2019-07-08T20:40:02.86 0.1 undecidable manual S 69 0.1043 128 -0.01 100
IV.OSSC.HHZ. 2019-07-08T20:40:02.98 0.3 undecidable manual S 37 0.1097 126 -0.05 74
IV.CSNT.HHZ. 2019-07-08T20:40:00.70 0.1 negative manual P 69 0.1043 128 -0.02 100
IV.OSSC.HHZ. 2019-07-08T20:40:00.74 0.1 positive manual P 37 0.1097 126 -0.07 99
IV.FROS.CHZ. 2019-07-08T20:39:59.70 3.0 positive manual Pn -0.35 0
IV.PLLN.EHZ. 2019-07-08T20:39:58.19 3.0 negative manual Pg 3.92 0
CR.STON.BHZ. 2019-07-08T20:39:48.30 3.0 undecidable manual Pg 3.4 0
CR.HVAR.HHZ. 2019-07-08T20:39:41.60 3.0 undecidable manual Pg 0.84 0
IV.CMPR.HHZ. 2019-07-08T20:39:30.01 3.0 undecidable manual Sg -2.6 0
IV.TDS.HHZ. 2019-07-08T20:39:28.22 3.0 undecidable manual Pn -5.04 0
OT.OT14.EHZ. 2019-07-08T20:39:20.17 3.0 negative manual P -2.02 0
IV.CMPR.HHZ. 2019-07-08T20:39:17.15 3.0 undecidable manual P -2.76 0
IT.VNF1.HGZ. 2019-07-08T20:39:16.79 3.0 positive manual P -5.39 0
IV.PAOL.HHZ. 2019-07-08T20:39:09.81 3.0 undecidable manual P -4.08 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.7 0.000684 0.1 AML other m 2019-07-08T20:40:03.07
IV.CSNT.HHN. ML:1.8 0.000874 1.44 AML other m 2019-07-08T20:40:03.95
IV.FROS.CHE. ML:1.9 0.0004585 0.3 AML other m 2019-07-08T20:40:03.25
IV.OSSC.HHE. ML:1.7 0.000611 0.46 AML other m 2019-07-08T20:40:03.48
IV.OSSC.HHN. ML:1.9 0.0010045 0.38 AML other m 2019-07-08T20:40:03.27
IV.OSSC.HNE. ML:1.9 0.001009 0.4 AML other m 2019-07-08T20:40:03.27
IV.OSSC.HNN. ML:1.7 0.0005805 0.78 AML other m 2019-07-08T20:40:03.48
IV.FROS.CHN. ML:1.7 0.0003305 1.1 AML other m 2019-07-08T20:40:03.06
IV.RUFI.EHE. ML:1.7 0.00012218368 0.3072 AML other m 2019-07-08T20:40:14.98
IV.RUFI.EHN. ML:1.5 8.3302885E-5 0.256 AML other m 2019-07-08T20:40:14.85
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