Earthquake with magnitude of ML 1.4 on date 21-07-2019 and time 03:51:43 (UTC) in region 2 km N Colle di Val d'Elsa (SI)

A magnitude ML 1.4 earthquake occured in region: 2 km N Colle di Val d'Elsa (SI), on

  • 21-07-2019 03:51:43 (UTC)
  • 21-07-2019 05:51:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.44, 11.12 at 8 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 2 21620 21620
Poggibonsi SI 4 29196 50816
San Gimignano SI 7 7820 58636
Monteriggioni SI 9 9810 68446
Casole d'Elsa SI 12 3897 72343
Barberino Val d'Elsa FI 12 4386 76729
Certaldo FI 14 16121 92850
Castellina in Chianti SI 14 2859 95709
Tavarnelle Val di Pesa FI 15 7800 103509
Gambassi Terme FI 18 4870 108379
Sovicille SI 20 10116 118495

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NW of Siena (53903 inhabitants)
36 Km S of Scandicci (50609 inhabitants)
39 Km S of Firenze (382808 inhabitants)
49 Km S of Prato (191150 inhabitants)
58 Km S of Pistoia (90315 inhabitants)
62 Km W of Arezzo (99543 inhabitants)
66 Km E of Pisa (89158 inhabitants)
67 Km E of Livorno (159219 inhabitants)
67 Km SE of Lucca (89046 inhabitants)
75 Km N of Grosseto (82087 inhabitants)
85 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 1.4 2019-07-21
03:51:43
43.44 11.12 9 2019-07-21
03:56:29
Sala Sismica INGV-Roma 70752751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-07-21 03:51:43 ± 0.12
Latitude 43.44 ± 0.01
Longitude 11.12 ± 0.01
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 70752751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1265
Semi-minor axis of confidence ellipse (meter) 650
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 117
Circular confidence region, given by single value of horizontal uncertainty (meter) 1270
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.12501
Epicentral distance of station farthest from the epicenter (degree) 0.51621
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 70752751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-07-21 03:56:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PII.HHZ. 2019-07-21T03:52:01.21 0.1 undecidable manual S 304 0.5162 50 -0.42 85
IV.RUFI.EHZ. 2019-07-21T03:52:00.84 0.6 undecidable manual S 35 0.4892 50 -0.01 46
IV.RUFI.EHZ. 2019-07-21T03:51:53.46 0.1 undecidable manual P 35 0.4892 50 0.02 93
IV.PII.HHZ. 2019-07-21T03:51:53.84 0.1 undecidable manual P 304 0.5162 50 -0.05 92
IV.FROS.CHZ. 2019-07-21T03:51:52.14 0.6 undecidable manual S 173 0.2293 108 -0.49 44
IV.MAGO.CHZ. 2019-07-21T03:51:51.99 0.1 undecidable manual P 244 0.3741 50 0.53 85
IV.FROS.CHZ. 2019-07-21T03:51:48.70 0.1 undecidable manual P 173 0.2293 108 0.01 98
IV.CSNT.HHZ. 2019-07-21T03:51:48.80 0.1 undecidable manual S 74 0.1286 121 -0.27 95
IV.OSSC.HHZ. 2019-07-21T03:51:48.96 0.1 undecidable manual S 47 0.125 121 0 100
IV.OSSC.HHZ. 2019-07-21T03:51:46.85 0.1 undecidable manual P 47 0.125 121 0.28 95
IV.CSNT.HHZ. 2019-07-21T03:51:46.79 0.1 undecidable manual P 74 0.1286 121 0.15 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.3 0.000231 0.18 AML other m 2019-07-21T03:51:49.11
IV.OSSC.HHE. ML:1.4 0.0002525 1.26 AML other m 2019-07-21T03:51:49.23
IV.CSNT.HHN. ML:1.6 0.0004395 0.56 AML other m 2019-07-21T03:51:49.04
IV.OSSC.HNN. ML:1.3 0.000226 0.86 AML other m 2019-07-21T03:51:49.34
IV.OSSC.HHN. ML:1.4 0.00027 0.34 AML other m 2019-07-21T03:51:49.41
IV.OSSC.HNE. ML:1.5 0.000311 0.32 AML other m 2019-07-21T03:51:49.41
IV.FROS.CHE. ML:1.7 0.000279 0.36 AML other m 2019-07-21T03:51:52.49
IV.FROS.CHN. ML:1.5 0.0001735 1.14 AML other m 2019-07-21T03:51:52.04
IV.MAGO.CHN. ML:1.6 0.0001295 0.12 AML other m 2019-07-21T03:51:57.09
IV.MAGO.CHE. ML:1.4 9.19E-5 0.72 AML other m 2019-07-21T03:51:57.45
IV.PII.HHE. ML:1.1 3.05E-5 0.72 AML other m 2019-07-21T03:52:01.78
IV.PII.HHN. ML:1.3 4.49E-5 0.26 AML other m 2019-07-21T03:52:03.68
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