Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 04-08-2019 and time 21:25:18 (Italy) in region 7 km SW Pomarance (PI)

A magnitude ML 0.8 earthquake occured in region: 7 km SW Pomarance (PI), on

  • 04-08-2019 19:25:18 (UTC)
  • 04-08-2019 21:25:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.2460, 10.8320 at 10 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
Pomarance PI 7 5897 5897
Castelnuovo di Val di Cecina PI 7 2231 8128
Monterotondo Marittimo GR 11 1371 9499
Monteverdi Marittimo PI 12 758 10257
Radicondoli SI 17 914 11171
Volterra PI 18 10519 21690
Montecatini Val di Cecina PI 18 1749 23439
Guardistallo PI 18 1234 24673
Casale Marittimo PI 18 1122 25795
Montescudaio PI 19 2144 27939
Bibbona LI 19 3175 31114
Montieri GR 20 1204 32318
Sassetta LI 20 514 32832

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Siena (53903 inhabitants)
54 Km SE of Livorno (159219 inhabitants)
59 Km NW of Grosseto (82087 inhabitants)
63 Km SE of Pisa (89158 inhabitants)
64 Km SW of Scandicci (50609 inhabitants)
68 Km SW of Firenze (382808 inhabitants)
72 Km SE of Lucca (89046 inhabitants)
74 Km SW of Prato (191150 inhabitants)
77 Km S of Pistoia (90315 inhabitants)
84 Km SE of Viareggio (62467 inhabitants)
89 Km W of Arezzo (99543 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 0.8 2019-08-04
19:25:18		 43.2463 10.8318 10 2019-08-04
19:40:48		 Sala Sismica INGV-Roma 71170761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-08-04 19:25:18 ± 0.16
Latitude 43.2463 ± 0.0117
Longitude 10.8318 ± 0.0198
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 71170761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1728
Semi-minor axis of confidence ellipse (meter) 1100
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 244
Circular confidence region, given by single value of horizontal uncertainty (meter) 1730.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.40290
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 5
Type of magnitude ML
Reference to an origin 71170761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-08-04 19:40:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IMTC.HHZ. 2019-08-04T19:26:57.72 3.0 undecidable manual Sn 2.06 0
IV.SARZ.HHZ. 2019-08-04T19:26:27.25 3.0 undecidable manual Sg 1.46 0
IV.IMI.HHZ. 2019-08-04T19:25:57.84 3.0 positive manual Pn -0.18 0
IV.FOSV.EHZ. 2019-08-04T19:25:43.94 3.0 positive manual P -2.82 0
IV.CELB.HHZ. 2019-08-04T19:25:33.08 3.0 undecidable manual P -0.75 0
IV.CSNT.HHZ. 2019-08-04T19:25:32.81 0.6 undecidable manual S 56 44.7219 50 -0.27 47
IV.RIBO.EHZ.01 2019-08-04T19:25:30.97 0.3 undecidable manual S 152 37.2294 50 -0.13 73
IV.CSNT.HHZ. 2019-08-04T19:25:27.27 0.3 undecidable manual P 56 44.7219 50 0.36 69
IV.FROS.CHZ. 2019-08-04T19:25:27.69 0.3 undecidable manual S 99 26.5512 50 -0.54 68
IV.RIBO.EHZ.01 2019-08-04T19:25:26.19 0.6 undecidable manual P 152 37.2294 50 0.42 46
IV.FROS.CHZ. 2019-08-04T19:25:24.30 0.1 undecidable manual P 99 26.5512 50 0.19 98
IV.MAGO.CHZ. 2019-08-04T19:25:24.08 0.3 undecidable manual S 282 14.3745 125 -0.51 70
IV.TRIF.CHZ. 2019-08-04T19:25:24.54 0.6 undecidable manual S 159 15.6732 123 -0.43 48
IV.MAGO.CHZ. 2019-08-04T19:25:22.22 0.1 positive manual P 282 14.3745 125 0.21 100
IV.TRIF.CHZ. 2019-08-04T19:25:22.68 0.3 undecidable manual P 159 15.6732 123 0.45 71
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:1.2 0.00014617275 0.064 AML other m 2019-08-04T19:25:25.11
IV.TRIF.CHN. ML:1.0 0.000101331415 0.0768 AML other m 2019-08-04T19:25:25.38
IV.FROS.CHE. ML:0.7 0.000028853459999999998 0.192 AML other m 2019-08-04T19:25:27.93
IV.FROS.CHN. ML:0.7 0.000024761475 0.064 AML other m 2019-08-04T19:25:28.66
IV.RIBO.EHE.01 ML:0.6 0.000013212405 0.3712 AML other m 2019-08-04T19:25:35.51
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