Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 01-07-2021 and time 22:25:12 (Italy) in region 3 km W Chiusdino (SI)

A magnitude ML 1.8 earthquake occured in region: 3 km W Chiusdino (SI), on

  • 01-07-2021 20:25:12 (UTC)
  • 01-07-2021 22:25:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1680, 11.0540 at 9 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
Chiusdino SI 3 1903 1903
Montieri GR 5 1204 3107
Radicondoli SI 11 914 4021
Monticiano SI 11 1571 5592
Castelnuovo di Val di Cecina PI 13 2231 7823
Monterotondo Marittimo GR 16 1371 9194
Massa Marittima GR 19 8375 17569
Sovicille SI 19 10116 27685
Casole d'Elsa SI 19 3897 31582
Roccastrada GR 20 9199 40781

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km SW of Siena (53903 inhabitants)
46 Km N of Grosseto (82087 inhabitants)
67 Km S of Scandicci (50609 inhabitants)
69 Km S of Firenze (382808 inhabitants)
74 Km SE of Livorno (159219 inhabitants)
75 Km W of Arezzo (99543 inhabitants)
79 Km S of Prato (191150 inhabitants)
81 Km SE of Pisa (89158 inhabitants)
86 Km S of Pistoia (90315 inhabitants)
87 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 1.8 2021-07-01
20:25:12		 43.1685 11.054 9 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97782331
Reviewed
Rev100 		ML 1.8 2021-07-01
20:25:12		 43.173 11.0593 8 2021-07-01
20:36:48		 Sala Sismica INGV-Roma 92120291
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-01 20:25:12 ± 0.09
Latitude 43.1685 ± 0.0054
Longitude 11.0540 ± 0.0086
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97782331

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 689
Semi-minor axis of confidence ellipse (meter) 449
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 279
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 46
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.36
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.98476
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 49
Type of magnitude ML
Reference to an origin 97782331
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-25 14:11:37

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 49
Type of magnitude ML
Reference to an origin 92120291
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-01 20:36:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PZZ.HHZ. 2021-07-01T20:26:57.98 3.0 undecidable manual Sg 18.389999 0
MN.TRI.HHZ. 2021-07-01T20:26:40.05 3.0 undecidable manual Sn -0.64 0
IV.ZEN8.EHZ. 2021-07-01T20:26:30.83 3.0 undecidable manual Sg 7.67 0
IV.SBPO.HNZ. 2021-07-01T20:25:43.66 3.0 negative manual Pn -0.38 0
IV.BDI.HHZ. 2021-07-01T20:25:31.14 0.3 undecidable manual P 340 105.8163 50 0.57 55
IV.PARC.HHZ. 2021-07-01T20:25:31.76 0.6 undecidable manual P 60 109.3128 50 0.65 35
GU.POPM.HHZ. 2021-07-01T20:25:30.20 1.0 undecidable manual P 346 100.122 50 0.51 19
GU.MAIM.HHZ. 2021-07-01T20:25:29.21 0.6 undecidable manual P 331 94.1391 50 0.44 39
IV.MGAB.HHZ. 2021-07-01T20:25:28.53 0.6 undecidable manual P 108 90.3429 50 0.34 40
IV.CRE.HHZ. 2021-07-01T20:25:28.83 0.6 undecidable manual P 55 87.9453 50 1.01 31
IV.MPPT.EHZ. 2021-07-01T20:25:28.12 0.3 undecidable manual P 2 87.5457 50 0.36 61
IV.BOSL.HHZ. 2021-07-01T20:25:28.73 0.6 undecidable manual P 17 88.4448 50 0.84 34
IV.RUFI.EHZ. 2021-07-01T20:25:27.40 0.6 undecidable manual P 26 82.8504 50 0.37 41
IV.ARCI.HHZ. 2021-07-01T20:25:27.80 0.6 undecidable manual S 136 49.0176 50 -0.76 38
IV.CELB.HHZ. 2021-07-01T20:25:27.91 0.6 undecidable manual P 236 82.9503 50 0.86 34
IV.OSSC.HHZ. 2021-07-01T20:25:26.00 0.3 undecidable manual S 21 42.3243 50 -0.77 57
IV.CASP.HHZ. 2021-07-01T20:25:26.76 0.6 undecidable manual S 200 44.622 50 -0.63 40
IV.CAFI.HHZ. 2021-07-01T20:25:26.13 0.3 undecidable manual P 76 75.8685 50 0.18 64
IV.PII.HHZ. 2021-07-01T20:25:25.69 0.3 undecidable manual P 325 74.7696 50 -0.09 66
IV.CRMI.HHZ. 2021-07-01T20:25:25.24 0.3 undecidable manual P 355 69.7746 50 0.22 65
IV.CSNT.HHZ. 2021-07-01T20:25:24.87 0.3 undecidable manual S 29 38.8278 50 -0.96 53
IV.MCIV.CHZ. 2021-07-01T20:25:24.66 0.3 undecidable manual P 130 66.4779 50 0.14 66
TV.SF04.EHZ. 2021-07-01T20:25:23.93 0.3 undecidable manual P 127 61.494 50 0.19 66
TV.SF01.EHZ. 2021-07-01T20:25:23.21 0.3 undecidable manual P 134 57.1983 50 0.13 67
IV.MAGO.CHZ. 2021-07-01T20:25:23.37 0.6 undecidable manual S 290 34.0437 50 -1.2 32
IV.CASP.HHZ. 2021-07-01T20:25:21.37 0.3 undecidable manual P 200 44.622 50 0.23 67
IV.ARCI.HHZ. 2021-07-01T20:25:21.80 0.1 negative manual P 136 49.0176 50 -0.02 93
IV.RIBO.EHZ.01 2021-07-01T20:25:21.26 0.3 undecidable manual S 181 24.3534 111 -0.38 68
IV.CSNT.HHZ. 2021-07-01T20:25:20.01 0.1 positive manual P 29 38.8278 50 -0.23 91
IV.OSSC.HHZ. 2021-07-01T20:25:20.63 0.1 positive manual P 21 42.3243 50 -0.15 92
IV.MAGO.CHZ. 2021-07-01T20:25:19.34 0.1 negative manual P 290 34.0437 50 -0.17 93
IV.TRIF.CHZ. 2021-07-01T20:25:18.04 0.3 undecidable manual S 244 13.5753 124 -0.27 71
IV.RIBO.EHZ.01 2021-07-01T20:25:17.91 0.1 negative manual P 181 24.3534 111 0.09 96
IV.FROS.CHZ. 2021-07-01T20:25:16.71 0.3 undecidable manual S 61 9.4794 134 -0.47 68
IV.TRIF.CHZ. 2021-07-01T20:25:16.10 0.1 positive manual P 244 13.5753 124 0.21 95
IV.FROS.CHZ. 2021-07-01T20:25:15.26 0.1 negative manual P 61 9.4794 134 0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:2.8 0.009739725 0.2048 AML other m 2021-07-01T20:25:16.78
IV.FROS.CHN. ML:2.6 0.006325 0.08 AML other m 2021-07-01T20:25:16.91
IV.TRIF.CHN. ML:2.5 0.0031390734999999998 0.1024 AML other m 2021-07-01T20:25:18.46
IV.TRIF.CHE. ML:2.6 0.004279999999999999 0.12 AML other m 2021-07-01T20:25:18.60
IV.RIBO.EHE.01 ML:2.4 0.001596164 0.2048 AML other m 2021-07-01T20:25:21.42
IV.MAGO.CHN. ML:2.1 0.0005304999999999999 0.12 AML other m 2021-07-01T20:25:23.49
IV.ARCI.HHN. ML:1.7 0.0001379358 0.2048 AML other m 2021-07-01T20:25:23.71
IV.ARCI.HNN. ML:1.7 0.00012310643 0.2048 AML other m 2021-07-01T20:25:23.72
IV.MAGO.CHE. ML:2.1 0.0005729999999999999 0.08 AML other m 2021-07-01T20:25:23.84
IV.ARCI.HHE. ML:1.7 0.00013804720000000002 1.7824 AML other m 2021-07-01T20:25:24.02
IV.ARCI.HNE. ML:1.7 0.0001385097 1.7824 AML other m 2021-07-01T20:25:24.03
TV.SF04.EHE. ML:2.2 0.0002959752 0.1792 AML other m 2021-07-01T20:25:24.60
TV.SF04.EHN. ML:2.3 0.00040031539999999997 0.2432 AML other m 2021-07-01T20:25:25.15
IV.CSNT.HHE. ML:1.9 0.000267748 0.128 AML other m 2021-07-01T20:25:25.18
IV.CSNT.HHN. ML:2.0 0.00031996085 0.1536 AML other m 2021-07-01T20:25:25.13
IV.MCIV.CHE. ML:2.0 0.000183 0.14 AML other m 2021-07-01T20:25:25.42
IV.MCIV.CHN. ML:1.8 0.0001125 0.28 AML other m 2021-07-01T20:25:25.30
IV.OSSC.HHN. ML:1.8 0.000179493175 0.2048 AML other m 2021-07-01T20:25:26.30
IV.CASP.HHE. ML:2.4 0.00070619245 0.2048 AML other m 2021-07-01T20:25:26.97
IV.CASP.HNE. ML:2.4 0.0007612848500000001 0.2048 AML other m 2021-07-01T20:25:26.98
IV.CASP.HHN. ML:2.4 0.0007121866000000001 1.8976 AML other m 2021-07-01T20:25:26.97
IV.CASP.HNN. ML:2.3 0.0006282185499999999 0.192 AML other m 2021-07-01T20:25:26.98
IV.CELB.HHE. ML:2.2 0.00019 0.06 AML other m 2021-07-01T20:25:28.53
IV.OSSC.HHE. ML:1.6 0.00014278309999999998 0.2176 AML other m 2021-07-01T20:25:28.61
IV.MGAB.HHE. ML:1.2 0.000021841129 0.2944 AML other m 2021-07-01T20:25:31.66
TV.SF01.EHE. ML:2.2 0.0003195 0.26 AML other m 2021-07-01T20:25:31.56
TV.SF01.EHN. ML:2.1 0.00028794249999999997 0.2176 AML other m 2021-07-01T20:25:31.56
IV.CRMI.HHN. ML:1.5 0.000054 0.24 AML other m 2021-07-01T20:25:35.25
IV.CAFI.HHN. ML:1.2 0.000023513655000000002 1.8592 AML other m 2021-07-01T20:25:35.00
IV.PII.HHN. ML:2.1 0.00017749999999999998 0.26 AML other m 2021-07-01T20:25:37.17
IV.PII.HHE. ML:1.9 0.0001305 0.24 AML other m 2021-07-01T20:25:37.33
IV.RUFI.EHN. ML:1.7 0.000060700000000000005 0.2 AML other m 2021-07-01T20:25:38.04
IV.RUFI.EHE. ML:1.8 0.00008410000000000001 0.2 AML other m 2021-07-01T20:25:38.14
IV.CAFI.HHE. ML:1.2 0.0000250789435 0.3328 AML other m 2021-07-01T20:25:38.57
IV.CRMI.HHE. ML:1.2 0.000026815159999999998 0.6144 AML other m 2021-07-01T20:25:38.46
IV.CELB.HHN. ML:1.8 0.00009034685000000001 0.1024 AML other m 2021-07-01T20:25:38.86
IV.BOSL.HHE. ML:1.5 0.000039099999999999995 0.34 AML other m 2021-07-01T20:25:40.29
IV.BOSL.HHN. ML:1.3 0.000025039405 0.2816 AML other m 2021-07-01T20:25:40.18
IV.CRE.HHE. ML:1.5 0.000036607244999999994 0.256 AML other m 2021-07-01T20:25:40.25
IV.CRE.HHN. ML:1.7 0.00005255799 0.2816 AML other m 2021-07-01T20:25:40.30
IV.MPPT.EHN. ML:1.5 0.000035394565000000006 0.2688 AML other m 2021-07-01T20:25:41.58
GU.MAIM.HHN. ML:1.4 0.00002806883 0.3584 AML other m 2021-07-01T20:25:41.70
IV.MGAB.HHN. ML:1.3 0.00002495 1.18 AML other m 2021-07-01T20:25:42.25
IV.MPPT.EHE. ML:1.4 0.00003100515 1.3984 AML other m 2021-07-01T20:25:45.22
GU.POPM.HHE. ML:1.8 0.0000577 0.24 AML other m 2021-07-01T20:25:45.50
GU.POPM.HHN. ML:1.8 0.00006187616499999999 0.192 AML other m 2021-07-01T20:25:45.52
IV.BDI.HHE. ML:1.4 0.00002355808 0.32 AML other m 2021-07-01T20:25:46.13
IV.PARC.HHN. ML:1.2 0.0000128956495 0.576 AML other m 2021-07-01T20:25:51.49
IV.PARC.HHE. ML:1.1 0.000011303763499999999 0.4224 AML other m 2021-07-01T20:25:54.93
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