Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 24-07-2020 and time 01:22:30 (Italy) in region 4 km SE Lajatico (PI)

A magnitude ML 1.2 earthquake occured in region: 4 km SE Lajatico (PI), on

  • 23-07-2020 23:22:30 (UTC)
  • 24-07-2020 01:22:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4530, 10.7650 at 5 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Lajatico PI 4 1336 1336
Montecatini Val di Cecina PI 7 1749 3085
Volterra PI 10 10519 13604
Chianni PI 11 1392 14996
Terricciola PI 11 4627 19623
Peccioli PI 11 4807 24430
Casciana Terme Lari PI 14 12529 36959
Castellina Marittima PI 16 2025 38984
Capannoli PI 16 6381 45365
Santa Luce PI 16 1684 47049
Riparbella PI 16 1603 48652
Montaione FI 16 3700 52352
Palaia PI 17 4612 56964
Montescudaio PI 18 2144 59108
Gambassi Terme FI 18 4870 63978
Guardistallo PI 19 1234 65212
Pomarance PI 19 5897 71109

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Livorno (159219 inhabitants)
41 Km SE of Pisa (89158 inhabitants)
48 Km SW of Scandicci (50609 inhabitants)
48 Km W of Siena (53903 inhabitants)
49 Km SE of Lucca (89046 inhabitants)
53 Km SW of Firenze (382808 inhabitants)
55 Km SW of Prato (191150 inhabitants)
55 Km S of Pistoia (90315 inhabitants)
62 Km SE of Viareggio (62467 inhabitants)
82 Km NW of Grosseto (82087 inhabitants)
82 Km SE of Massa (69479 inhabitants)
88 Km SE of Carrara (63133 inhabitants)
90 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
Bulletin
Rev1000 		ML 1.2 2020-07-23
23:22:30		 43.4527 10.7652 5 2020-11-19
12:37:00		 Bollettino Sismico Italiano INGV 82778031
Reviewed
Rev100 		ML 1.2 2020-07-23
23:22:30		 43.4643 10.7742 1 2020-07-23
23:30:32		 Sala Sismica INGV-Roma 81287791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-23 23:22:30 ± 0.14
Latitude 43.4527 ± 0.0063
Longitude 10.7652 ± 0.0124
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 82778031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1037
Semi-minor axis of confidence ellipse (meter) 340
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 260
Circular confidence region, given by single value of horizontal uncertainty (meter) 1040.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 123
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.66550
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 81287791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-23 23:30:32

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 82778031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-09-10 01:56:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SLCN.HHZ. 2020-07-23T23:24:43.92 3.0 undecidable manual Sn 3.97 0
IV.MESG.HHZ. 2020-07-23T23:24:18.26 3.0 positive manual Pg 17.68 0
IV.ROSPO.HHZ. 2020-07-23T23:24:08.36 3.0 undecidable manual Sn 3.96 0
IV.CMPR.HHZ. 2020-07-23T23:23:57.44 3.0 undecidable manual Pg 15.99 0
IV.SLCN.HHZ. 2020-07-23T23:23:54.18 3.0 undecidable manual Pg 10.87 0
IV.ROSPO.HHZ. 2020-07-23T23:23:31.26 3.0 positive manual Pg 7.92 0
IV.CRTC.HHZ. 2020-07-23T23:23:22.65 3.0 undecidable manual S 0.6 0
IV.CTI.HHZ. 2020-07-23T23:23:13.87 3.0 undecidable manual Pn -0.51 0
IV.EUCT.HNZ. 2020-07-23T23:23:05.94 3.0 undecidable manual Pn -0.55 0
GU.MAIM.HHZ. 2020-07-23T23:22:47.48 0.6 undecidable manual S 337 55.6998 50 -1.61 25
IV.CRMI.HNN. 2020-07-23T23:22:45.24 0.6 undecidable manual S 24 41.7249 97 0.22 47
IV.CASP.HHZ. 2020-07-23T23:22:44.14 0.3 undecidable manual P 174 73.8705 50 0.14 68
IV.CSNT.HHZ. 2020-07-23T23:22:44.71 0.6 undecidable manual S 87 42.3243 97 -0.51 44
GU.POPM.HHZ. 2020-07-23T23:22:43.14 0.3 undecidable manual P 359 65.6898 50 0.4 65
IV.FROS.CHE. 2020-07-23T23:22:43.98 0.6 undecidable manual S 130 41.5251 97 -0.96 37
IV.TRIF.CHZ. 2020-07-23T23:22:43.30 0.3 undecidable manual S 163 39.1275 97 -0.81 59
IV.BDI.HHZ. 2020-07-23T23:22:43.20 0.3 undecidable manual P 349 69.0753 50 -0.05 70
IV.MPPT.EHN. 2020-07-23T23:22:42.64 0.3 undecidable manual P 25 61.7937 50 0.5 64
IV.PII.HHZ. 2020-07-23T23:22:41.87 0.3 undecidable manual S 327 35.5422 98 -1.03 54
GU.MAIM.HHZ. 2020-07-23T23:22:41.11 0.3 undecidable manual P 337 55.6998 50 -0.09 71
IV.CRMI.HNN. 2020-07-23T23:22:39.31 0.1 undecidable manual P 24 41.7249 97 0.46 90
IV.CSNT.HHZ. 2020-07-23T23:22:39.26 0.1 undecidable manual P 87 42.3243 97 0.29 93
IV.FROS.CHE. 2020-07-23T23:22:38.93 0.3 undecidable manual P 130 41.5251 97 0.12 73
IV.TRIF.CHZ. 2020-07-23T23:22:38.22 0.1 undecidable manual P 163 39.1275 97 -0.11 97
IV.MAGO.CHZ. 2020-07-23T23:22:38.52 0.3 undecidable manual S 204 21.6672 103 0.36 71
IV.PII.HHZ. 2020-07-23T23:22:37.64 0.1 positive manual P 327 35.5422 98 0.01 100
IV.MAGO.CHZ. 2020-07-23T23:22:35.30 0.1 positive manual P 204 21.6672 103 0.4 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MAGO.CHE. ML:1.6 0.000307 0.22 AML other m 2020-07-23T23:22:40.65
IV.MAGO.CHN. ML:1.6 0.0002925 0.26 AML other m 2020-07-23T23:22:40.62
IV.PII.HHN. ML:1.2 0.000066 0.32 AML other m 2020-07-23T23:22:42.87
IV.PII.HHE. ML:1.3 0.00007445000000000001 0.5 AML other m 2020-07-23T23:22:43.25
IV.TRIF.CHE. ML:1.1 0.000048049999999999996 1.02 AML other m 2020-07-23T23:22:43.95
IV.TRIF.CHN. ML:1.0 0.000041800000000000006 1.1 AML other m 2020-07-23T23:22:44.64
IV.CSNT.HHE. ML:0.7 0.000013250000000000002 0.6 AML other m 2020-07-23T23:22:45.91
IV.CSNT.HHN. ML:0.8 0.00001935 1.46 AML other m 2020-07-23T23:22:46.73
GU.POPM.HHN. ML:1.1 0.0000264 0.84 AML other m 2020-07-23T23:22:53.35
GU.POPM.HHE. ML:0.9 0.00001745 1.1 AML other m 2020-07-23T23:22:54.06
IV.CASP.HHN. ML:1.6 0.0000555 1.62 AML other m 2020-07-23T23:22:55.96
IV.CASP.HHE. ML:1.3 0.000028499999999999998 0.82 AML other m 2020-07-23T23:22:57.49
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