Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 17-12-2020 and time 05:26:05 (Italy) in region 2 km W Pieve Santo Stefano (AR)

A magnitude ML 1.0 earthquake occured in region: 2 km W Pieve Santo Stefano (AR), on

  • 17-12-2020 04:26:05 (UTC)
  • 17-12-2020 05:26:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.6650, 12.0220 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
Pieve Santo Stefano AR 2 3183 3183
Caprese Michelangelo AR 4 1426 4609
Chiusi della Verna AR 8 2023 6632
Chitignano AR 11 899 7531
Anghiari AR 14 5638 13169
Badia Tedalda AR 14 1087 14256
Sansepolcro AR 14 15884 30140
Verghereto FC 15 1907 32047
Castel Focognano AR 15 3149 35196
Subbiano AR 16 6331 41527
Bibbiena AR 17 12241 53768
Capolona AR 17 5438 59206
Casteldelci RN 18 407 59613
San Giustino PG 18 11297 70910
Citerna PG 20 3531 74441

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km NE of Arezzo (99543 inhabitants)
55 Km SW of Cesena (96758 inhabitants)
62 Km SW of Rimini (147750 inhabitants)
62 Km S of Forlì (117913 inhabitants)
63 Km E of Firenze (382808 inhabitants)
68 Km NE of Siena (53903 inhabitants)
68 Km E of Scandicci (50609 inhabitants)
69 Km NW of Perugia (166134 inhabitants)
70 Km S of Faenza (58541 inhabitants)
77 Km W of Pesaro (94582 inhabitants)
78 Km E of Prato (191150 inhabitants)
80 Km SE of Imola (69797 inhabitants)
83 Km W of Fano (60888 inhabitants)
85 Km S of Ravenna (159116 inhabitants)
94 Km E of Pistoia (90315 inhabitants)
96 Km NW of Foligno (57155 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 1.0 2020-12-17
04:26:05		 43.6652 12.0217 9 2021-02-26
14:56:16		 Bollettino Sismico Italiano INGV 86502281
Reviewed
Rev100 		ML 1.0 2020-12-17
04:26:05		 43.681 12.0307 9 2020-12-17
04:31:42		 Sala Sismica INGV-Roma 85486961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-17 04:26:05 ± 0.05
Latitude 43.6652 ± 0.0036
Longitude 12.0217 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86502281

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 479
Semi-minor axis of confidence ellipse (meter) 132
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 208
Circular confidence region, given by single value of horizontal uncertainty (meter) 480.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.06835
Epicentral distance of station farthest from the epicenter (degree) 0.68618
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 86502281
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-23 17:11:44

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 85486961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-17 04:31:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2020-12-17T04:26:19.69 0.3 undecidable manual P 104 76.1682 50 0.61 58
IV.RINC.HHN. 2020-12-17T04:26:19.66 0.3 undecidable manual S 307 41.3253 50 0.1 70
IV.ATPI.EHZ. 2020-12-17T04:26:18.94 0.3 undecidable manual S 128 38.7279 50 0.06 71
IV.CAFI.HHZ. 2020-12-17T04:26:18.37 0.6 undecidable manual S 187 37.5291 50 -0.18 46
IV.APEC.HHZ. 2020-12-17T04:26:17.75 0.3 undecidable manual S 110 34.1436 50 0.11 71
IV.LMD.HHE. 2020-12-17T04:26:15.54 0.3 undecidable manual P 331 52.2033 50 0.16 68
IV.ATVO.HHZ. 2020-12-17T04:26:14.03 0.3 undecidable manual P 135 44.1225 50 -0.1 70
IV.ASQU.HHZ. 2020-12-17T04:26:14.28 0.6 undecidable manual S 308 23.6541 112 -0.24 47
IV.BADI.EHZ. 2020-12-17T04:26:14.58 0.6 undecidable manual S 134 24.8529 111 -0.33 46
IV.RUFI.EHZ. 2020-12-17T04:26:14.20 0.3 undecidable manual P 295 45.3213 50 -0.11 70
IV.CAFI.HHZ. 2020-12-17T04:26:13.02 0.1 undecidable manual P 187 37.5291 50 -0.1 95
IV.RINC.HHN. 2020-12-17T04:26:13.72 0.1 undecidable manual P 307 41.3253 50 0.02 95
IV.ATPI.EHZ. 2020-12-17T04:26:13.30 0.3 undecidable manual P 128 38.7279 50 -0.01 72
IV.NARO.HHZ. 2020-12-17T04:26:13.95 0.3 undecidable manual P 97 45.3213 50 -0.36 66
IV.PE3.EHZ. 2020-12-17T04:26:13.30 0.3 undecidable manual P 85 38.2284 50 0.07 71
IV.PARC.HHZ. 2020-12-17T04:26:12.26 0.1 undecidable manual S 96 17.4714 118 -0.32 93
IV.APEC.HHZ. 2020-12-17T04:26:12.43 0.3 undecidable manual P 110 34.1436 50 -0.16 70
IV.CPGN.EHZ. 2020-12-17T04:26:11.99 0.1 undecidable manual P 58 28.3494 108 0.32 92
IV.SSP9.EHZ. 2020-12-17T04:26:11.29 0.6 undecidable manual S 139 13.3755 125 -0.08 49
IT.SNS1.HNN. 2020-12-17T04:26:11.81 0.3 undecidable manual S 139 13.4754 125 0.44 69
IV.BADI.EHZ. 2020-12-17T04:26:10.78 0.3 undecidable manual P 134 24.8529 111 -0.23 71
IV.ASQU.HHZ. 2020-12-17T04:26:10.61 0.1 undecidable manual P 308 23.6541 112 -0.18 95
IV.SSP9.EHZ. 2020-12-17T04:26:09.04 0.1 undecidable manual P 139 13.3755 125 0.07 99
IT.SNS1.HNN. 2020-12-17T04:26:09.16 0.1 undecidable manual P 139 13.4754 125 0.19 97
IV.CRE.HHZ. 2020-12-17T04:26:09.95 0.1 undecidable manual S 228 7.5813 141 0.08 100
IV.PARC.HHZ. 2020-12-17T04:26:09.52 0.1 positive manual P 96 17.4714 118 -0.15 97
IV.CRE.HHZ. 2020-12-17T04:26:08.21 0.1 positive manual P 228 7.5813 141 0.1 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PARC.HHN. ML:1.7 0.00042200000000000007 0.12 AML other m 2020-12-17T04:26:12.45
IV.PARC.HHE. ML:1.1 0.00010835 0.14 AML other m 2020-12-17T04:26:12.75
IV.BADI.EHE. ML:0.9 0.00004375 0.66 AML other m 2020-12-17T04:26:15.88
IV.ASQU.HHE. ML:0.8 0.000041800000000000006 0.84 AML other m 2020-12-17T04:26:16.55
IV.ASQU.HHN. ML:0.8 0.000038350000000000004 1.48 AML other m 2020-12-17T04:26:17.08
IV.APEC.HHN. ML:1.1 0.000054449999999999995 1.42 AML other m 2020-12-17T04:26:18.23
IV.CAFI.HHE. ML:0.8 0.00002655 1.56 AML other m 2020-12-17T04:26:18.18
IV.CAFI.HHN. ML:1.0 0.0000348 0.92 AML other m 2020-12-17T04:26:19.96
IV.BADI.EHN. ML:0.7 0.0000315 1.24 AML other m 2020-12-17T04:26:20.80
IV.APEC.HHE. ML:1.1 0.00005645 1.6 AML other m 2020-12-17T04:26:21.13
IV.RUFI.EHE. ML:0.9 0.000024500000000000003 1.58 AML other m 2020-12-17T04:26:25.94
IV.RUFI.EHN. ML:1.1 0.000033405 0.42 AML other m 2020-12-17T04:26:38.26
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