Earthquake with magnitude of ML 0.8 on date 13-04-2021 and time 23:17:58 (Italy) in region 3 km E Montieri (GR)

A magnitude ML 0.8 earthquake occured in region: 3 km E Montieri (GR), on

  • 13-04-2021 21:17:58 (UTC)
  • 13-04-2021 23:17:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.137, 11.052 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montieri GR 3 1204 1204
Chiusdino SI 4 1903 3107
Monticiano SI 11 1571 4678
Radicondoli SI 14 914 5592
Castelnuovo di Val di Cecina PI 14 2231 7823
Monterotondo Marittimo GR 16 1371 9194
Massa Marittima GR 16 8375 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Siena (53903 inhabitants)
42 Km N of Grosseto (82087 inhabitants)
70 Km S of Scandicci (50609 inhabitants)
72 Km S of Firenze (382808 inhabitants)
76 Km SE of Livorno (159219 inhabitants)
77 Km W of Arezzo (99543 inhabitants)
83 Km S of Prato (191150 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
89 Km S of Pistoia (90315 inhabitants)
90 Km SE of Lucca (89046 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 0.8 2021-04-13
21:17:58
43.1368 11.0515 5 2021-07-12
16:55:15
Bollettino Sismico Italiano INGV 91330631
Reviewed
Rev100
ML 0.8 2021-04-13
21:17:58
43.1337 11.0347 8 2021-04-13
21:23:46
Sala Sismica INGV-Roma 89075551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-13 21:17:58 ± 0.07
Latitude 43.1368 ± 0.0036
Longitude 11.0515 ± 0.0049
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91330631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 520
Semi-minor axis of confidence ellipse (meter) 310
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 315
Circular confidence region, given by single value of horizontal uncertainty (meter) 520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.18796
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 3
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 89075551
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-13 21:23:46

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 91330631
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-15 12:58:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MTMR.EHZ. 2021-04-13T21:18:47.20 3.0 undecidable manual Pn -1.29 0
IV.CRTC.HHZ. 2021-04-13T21:18:13.18 3.0 negative manual Pg 7.39 0
IV.RIBO.EHZ. 2021-04-13T21:18:05.84 0.3 undecidable manual S 181 0.188 103 -0.16 72
IV.TRIF.CHZ. 2021-04-13T21:18:03.09 0.3 undecidable manual S 259 0.1106 112 -0.08 74
IV.RIBO.EHZ. 2021-04-13T21:18:03.10 0.3 undecidable manual P 181 0.188 103 0.24 71
IV.FROS.CHZ. 2021-04-13T21:18:02.98 0.3 undecidable manual S 46 0.1052 113 -0.01 75
IV.FROS.CHZ. 2021-04-13T21:18:01.08 0.1 positive manual P 46 0.1052 113 -0.04 100
IV.TRIF.CHZ. 2021-04-13T21:18:01.29 0.1 undecidable manual P 259 0.1106 112 0.06 100
ST.CARE.EHZ. 2021-04-13T21:17:43.28 3.0 negative manual P -0.15 0
IV.VARE.HHZ. 2021-04-13T21:17:38.13 3.0 undecidable manual P 0 0
IV.ZONE.HHZ. 2021-04-13T21:17:35.71 3.0 undecidable manual P 0.02 0
IV.CADC.EHZ. 2021-04-13T21:17:35.09 3.0 undecidable manual P -0.08 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VARE.HHE. ML:3 8.72E-5 0.14 AML other m 2021-04-13T21:17:40.88
IV.VARE.HHN. ML:3.8 0.0004675 0.18 AML other m 2021-04-13T21:17:41.40
ST.CARE.EHN. ML:4.8 0.00455 0.72 AML other m 2021-04-13T21:18:02.52
IV.TRIF.CHN. ML:0.9 9.8E-5 0.1 AML other m 2021-04-13T21:18:03.20
IV.TRIF.CHE. ML:0.8 8.435E-5 0.64 AML other m 2021-04-13T21:18:03.52
ST.CARE.EHE. ML:4.8 0.004435 1.08 AML other m 2021-04-13T21:18:03.33
IV.FROS.CHE. ML:0.4 3.82689E-5 1.1264 AML other m 2021-04-13T21:18:03.93
IV.RIBO.EHE.01 ML:0.9 6.6249415E-5 0.0224 AML other m 2021-04-13T21:18:05.08
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