Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 13-03-2021 and time 02:55:31 (Italy) in region 4 km SW Sansepolcro (AR)

A magnitude ML 1.8 earthquake occured in region: 4 km SW Sansepolcro (AR), on

  • 13-03-2021 01:55:31 (UTC)
  • 13-03-2021 02:55:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.5490, 12.1110 at 8 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
Sansepolcro AR 4 15884 15884
Anghiari AR 4 5638 21522
San Giustino PG 5 11297 32819
Citerna PG 6 3531 36350
Monterchi AR 7 1757 38107
Monte Santa Maria Tiberina PG 13 1183 39290
Pieve Santo Stefano AR 14 3183 42473
Città di Castello PG 15 39913 82386
Caprese Michelangelo AR 15 1426 83812
Badia Tedalda AR 19 1087 84899
Borgo Pace PU 19 606 85505
Subbiano AR 20 6331 91836

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km E of Arezzo (99543 inhabitants)
54 Km NW of Perugia (166134 inhabitants)
66 Km S of Cesena (96758 inhabitants)
68 Km SW of Rimini (147750 inhabitants)
68 Km E of Siena (53903 inhabitants)
73 Km E of Firenze (382808 inhabitants)
75 Km S of Forlì (117913 inhabitants)
76 Km SW of Pesaro (94582 inhabitants)
78 Km E of Scandicci (50609 inhabitants)
80 Km W of Fano (60888 inhabitants)
82 Km NW of Foligno (57155 inhabitants)
84 Km S of Faenza (58541 inhabitants)
89 Km E of Prato (191150 inhabitants)
95 Km SE of Imola (69797 inhabitants)
97 Km S of Ravenna (159116 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 2021-03-13
01:55:31		 43.5492 12.1107 8 2021-07-12
16:55:02		 Bollettino Sismico Italiano INGV 88213491
Reviewed
Rev100 		ML 1.9 2021-03-13
01:55:31		 43.5512 12.115 9 2021-03-13
02:01:04		 Sala Sismica INGV-Roma 88067861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-13 01:55:31 ± 0.06
Latitude 43.5492 ± 0.0027
Longitude 12.1107 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88213491

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 369
Semi-minor axis of confidence ellipse (meter) 254
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 237
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 70
Number of defining phases 68
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.87594
Number of stations at which the event was observed 37
Number of stations from which data was used for origin computation 35
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 41
Type of magnitude ML
Reference to an origin 88213491
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-28 15:21:09

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 88067861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-13 02:01:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LAV9.HHZ. 2021-03-13T01:56:29.88 3.0 undecidable manual Sn 0.44 0
GU.CARD.HHZ. 2021-03-13T01:56:17.07 3.0 undecidable manual S 3.33 0
IV.MGAB.HHZ. 2021-03-13T01:55:54.55 0.6 undecidable manual S 180 70.5738 50 1.02 32
IV.LMD.HHZ. 2021-03-13T01:55:53.02 0.3 undecidable manual S 331 66.8775 50 0.48 61
IV.ARVD.HHZ. 2021-03-13T01:55:53.22 0.3 undecidable manual S 95 67.0773 50 0.64 57
IV.CRTC.HHZ. 2021-03-13T01:55:52.54 0.3 undecidable manual S 68 66.5778 50 0.09 66
IV.ATCC.EHZ. 2021-03-13T01:55:51.33 0.6 undecidable manual S 133 58.7967 50 0.96 34
IV.FOSV.EHZ. 2021-03-13T01:55:51.34 0.3 undecidable manual S 118 59.496 50 0.77 55
IV.SSFR.HHZ. 2021-03-13T01:55:49.89 0.6 undecidable manual S 103 55.5 50 0.4 42
IV.MPAG.EHZ. 2021-03-13T01:55:48.80 0.6 undecidable manual S 80 52.9026 50 0 46
IV.FDMO.HHZ. 2021-03-13T01:55:48.50 0.3 undecidable manual P 125 97.2249 50 0.14 62
IV.FRON.EHZ. 2021-03-13T01:55:47.74 0.6 undecidable manual S 94 49.617 50 -0.18 45
IV.MURB.HHZ. 2021-03-13T01:55:47.52 0.6 undecidable manual S 133 46.0206 50 0.55 41
IV.SFI.EHZ. 2021-03-13T01:55:46.50 0.6 undecidable manual S 332 44.7219 50 -0.13 46
IV.ATFO.HHZ. 2021-03-13T01:55:45.97 0.6 undecidable manual S 118 42.3243 50 0 47
IV.CPGN.EHZ. 2021-03-13T01:55:44.25 0.6 undecidable manual S 31 32.6451 104 0.97 35
IV.ASQU.HHZ. 2021-03-13T01:55:44.03 0.3 undecidable manual S 317 37.629 50 -0.7 59
IV.NARO.HHZ. 2021-03-13T01:55:44.60 0.1 undecidable manual S 80 38.3283 50 -0.32 88
IV.ATBU.EHZ. 2021-03-13T01:55:44.63 0.1 undecidable manual S 103 36.1416 50 0.3 89
IV.PE3.EHZ. 2021-03-13T01:55:44.01 0.6 undecidable manual S 62 35.0427 50 -0.01 47
IV.CRTC.HHZ. 2021-03-13T01:55:44.06 0.3 undecidable manual P 68 66.5778 50 0.42 62
IV.CSNT.HHZ. 2021-03-13T01:55:44.06 0.3 undecidable manual P 263 66.5778 50 0.43 62
IV.MGAB.HHZ. 2021-03-13T01:55:44.49 0.1 undecidable manual P 180 70.5738 50 0.23 85
IV.ATLO.EHE. 2021-03-13T01:55:43.54 0.6 undecidable manual S 137 35.2425 50 -0.56 42
IV.LMD.HHZ. 2021-03-13T01:55:43.98 0.1 undecidable manual P 331 66.8775 50 0.29 84
IV.ARVD.HHZ. 2021-03-13T01:55:43.63 0.1 undecidable manual P 95 67.0773 50 -0.09 88
IV.TB03.DHZ.01 2021-03-13T01:55:42.08 0.1 undecidable manual S 124 29.1486 106 -0.04 95
IV.TB02.DHZ.01 2021-03-13T01:55:42.65 0.1 undecidable manual S 129 31.1466 105 -0.14 93
IV.FOSV.EHZ. 2021-03-13T01:55:42.59 0.3 undecidable manual P 118 59.496 50 0.04 68
IV.ATPC.HNZ. 2021-03-13T01:55:42.15 0.1 undecidable manual S 105 28.8489 106 0.13 94
IV.TB01.DHZ.01 2021-03-13T01:55:42.90 0.1 undecidable manual S 125 32.1456 104 -0.2 92
IV.ATVA.EHE. 2021-03-13T01:55:42.61 0.6 undecidable manual S 155 33.1446 104 -0.84 37
IV.ATPI.EHZ. 2021-03-13T01:55:41.01 0.1 undecidable manual S 115 25.8519 108 -0.02 96
IV.SSFR.HHZ. 2021-03-13T01:55:41.58 0.1 undecidable manual P 103 55.5 50 -0.35 85
IV.ATMI.HHZ. 2021-03-13T01:55:41.32 0.1 undecidable manual S 152 27.0507 107 -0.08 95
IV.ATCC.EHZ. 2021-03-13T01:55:41.12 0.3 undecidable manual P 133 58.7967 50 -1.31 43
IV.CAFI.HHZ. 2021-03-13T01:55:41.47 0.1 undecidable manual S 206 27.0507 107 0.06 95
IV.MPAG.EHZ. 2021-03-13T01:55:41.22 0.1 undecidable manual P 80 52.9026 50 -0.31 86
IV.FRON.EHZ. 2021-03-13T01:55:40.53 0.1 undecidable manual P 94 49.617 50 -0.49 83
IV.MURB.HHZ. 2021-03-13T01:55:40.35 0.1 undecidable manual P 133 46.0206 50 -0.12 91
IV.SFI.EHZ. 2021-03-13T01:55:40.31 0.1 undecidable manual P 332 44.7219 50 0.04 93
IV.APEC.HHZ. 2021-03-13T01:55:40.81 0.1 undecidable manual S 88 24.8529 108 0.11 95
IV.ATFO.HHZ. 2021-03-13T01:55:39.58 0.3 undecidable manual P 118 42.3243 50 -0.31 66
IV.ASQU.HHZ. 2021-03-13T01:55:39.05 0.3 undecidable manual P 317 37.629 50 -0.13 69
IV.CPGN.EHZ. 2021-03-13T01:55:38.66 0.1 undecidable manual P 31 32.6451 104 0.32 89
IV.TB01.DHZ.01 2021-03-13T01:55:38.06 0.1 undecidable manual P 125 32.1456 104 -0.18 92
IV.PE3.EHZ. 2021-03-13T01:55:38.49 0.1 undecidable manual P 62 35.0427 50 -0.28 90
IV.ATVA.EHE. 2021-03-13T01:55:38.00 0.3 undecidable manual P 155 33.1446 104 -0.44 65
IV.TB02.DHZ.01 2021-03-13T01:55:38.03 0.1 undecidable manual P 129 31.1466 105 -0.03 95
IV.ATLO.EHE. 2021-03-13T01:55:38.59 0.1 undecidable manual P 137 35.2425 50 -0.23 91
IV.NARO.HHZ. 2021-03-13T01:55:38.89 0.1 undecidable manual P 80 38.3283 50 -0.4 87
IV.ATBU.EHZ. 2021-03-13T01:55:38.74 0.1 undecidable manual P 103 36.1416 50 -0.21 91
IV.CAFI.HHZ. 2021-03-13T01:55:37.46 0.1 positive manual P 206 27.0507 107 0.2 93
IV.ATMC.EHZ. 2021-03-13T01:55:37.00 0.1 undecidable manual S 150 13.1757 122 0.02 98
IV.ATPC.HNZ. 2021-03-13T01:55:37.51 0.1 undecidable manual P 105 28.8489 106 -0.11 94
IV.CDCA.HNE. 2021-03-13T01:55:37.61 0.1 undecidable manual S 135 14.0748 120 0.34 92
IV.TB03.DHZ.01 2021-03-13T01:55:37.55 0.1 undecidable manual P 124 29.1486 106 -0.12 94
IV.ATPI.EHZ. 2021-03-13T01:55:37.01 0.1 undecidable manual P 115 25.8519 108 -0.03 96
IV.PARC.HHZ. 2021-03-13T01:55:37.45 0.1 undecidable manual S 43 15.0738 119 -0.12 96
IV.ATMI.HHZ. 2021-03-13T01:55:37.26 0.1 undecidable manual P 152 27.0507 107 0 96
IV.APEC.HHZ. 2021-03-13T01:55:36.84 0.1 positive manual P 88 24.8529 108 -0.01 96
IV.BADI.EHZ. 2021-03-13T01:55:36.79 0.1 undecidable manual S 112 11.5773 125 0.25 94
IV.PARC.HHZ. 2021-03-13T01:55:35.14 0.1 positive manual P 43 15.0738 119 0.1 96
IV.CDCA.HNE. 2021-03-13T01:55:35.05 0.1 positive manual P 135 14.0748 120 0.17 95
IV.BADI.EHZ. 2021-03-13T01:55:34.74 0.1 negative manual P 112 11.5773 125 0.29 93
IV.SSP9.EHZ. 2021-03-13T01:55:34.39 0.1 undecidable manual S 31 3.1968 159 -0.28 95
IV.ATMC.EHZ. 2021-03-13T01:55:34.92 0.1 positive manual P 150 13.1757 122 0.21 95
IT.SNS1.HNE. 2021-03-13T01:55:34.70 0.1 undecidable manual S 31 3.1968 159 0.03 100
IT.SNS1.HNE. 2021-03-13T01:55:33.39 0.1 undecidable manual P 31 3.1968 159 0.02 100
IV.SSP9.EHZ. 2021-03-13T01:55:33.34 0.1 undecidable manual P 31 3.1968 159 -0.03 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BADI.EHE. ML:1.6 0.00044552375 0.3792 AML other m 2021-03-13T01:55:37.06
IV.BADI.EHN. ML:1.9 0.0009820534 0.28 AML other m 2021-03-13T01:55:37.06
IV.PARC.HHE. ML:1.8 0.0007190741 0.12 AML other m 2021-03-13T01:55:37.51
IV.PARC.HHN. ML:1.7 0.0005706198499999999 0.0992 AML other m 2021-03-13T01:55:37.51
IV.ATPI.EHE. ML:1.4 0.00013815454999999998 0.5792 AML other m 2021-03-13T01:55:41.07
IV.APEC.HNE. ML:2.2 0.0010898677 0.1696 AML other m 2021-03-13T01:55:41.15
IV.APEC.HHN. ML:2.4 0.0014622605000000001 0.16 AML other m 2021-03-13T01:55:41.07
IV.APEC.HNN. ML:2.2 0.00092444945 0.16 AML other m 2021-03-13T01:55:41.15
IV.APEC.HHE. ML:1.9 0.0005317707499999999 0.32 AML other m 2021-03-13T01:55:41.16
IV.ATPI.HNN. ML:1.6 0.00020408545 0.44 AML other m 2021-03-13T01:55:41.35
IV.ATPI.EHN. ML:1.5 0.000193762 0.4192 AML other m 2021-03-13T01:55:41.36
IV.CAFI.HNE. ML:1.5 0.00017401995 0.4992 AML other m 2021-03-13T01:55:41.85
IV.ATMI.HHN. ML:2.2 0.000901 0.1 AML other m 2021-03-13T01:55:41.65
IV.CAFI.HHN. ML:1.4 0.00013061924999999998 0.1808 AML other m 2021-03-13T01:55:41.68
IV.ATMI.HHE. ML:2.3 0.0010015 0.14 AML other m 2021-03-13T01:55:41.61
IV.CAFI.HHE. ML:1.5 0.00018194895 0.12 AML other m 2021-03-13T01:55:41.85
IV.NARO.HHN. ML:1.7 0.00018618600000000002 0.5408 AML other m 2021-03-13T01:55:44.94
IV.CPGN.EHN. ML:1.6 0.00018816105 0.5008 AML other m 2021-03-13T01:55:44.78
IV.CPGN.EHE. ML:2.0 0.00044699999999999997 1.58 AML other m 2021-03-13T01:55:44.99
IV.NARO.HHE. ML:1.7 0.00019555634999999998 0.08 AML other m 2021-03-13T01:55:45.05
IV.ATFO.HHE. ML:1.6 0.00014543435 0.3008 AML other m 2021-03-13T01:55:46.39
IV.ASQU.HHE. ML:1.4 0.0001036 0.44 AML other m 2021-03-13T01:55:46.49
IV.ATFO.HHN. ML:1.5 0.000098113935 0.24 AML other m 2021-03-13T01:55:46.56
IV.MURB.HHN. ML:2.0 0.00030425635 0.2608 AML other m 2021-03-13T01:55:47.89
IV.FRON.EHE. ML:1.4 0.00006714881 0.64 AML other m 2021-03-13T01:55:48.35
IV.MURB.HNN. ML:2.0 0.0002614845 0.3104 AML other m 2021-03-13T01:55:47.90
IV.MURB.HNE. ML:2.1 0.00037545265 0.2512 AML other m 2021-03-13T01:55:47.00
IV.MURB.HHE. ML:2.2 0.00041349999999999997 0.2 AML other m 2021-03-13T01:55:48.26
IV.FRON.EHN. ML:1.8 0.0001637865 0.12 AML other m 2021-03-13T01:55:48.36
IV.MPAG.EHN. ML:1.7 0.0001282 1.52 AML other m 2021-03-13T01:55:49.16
IV.MPAG.EHE. ML:1.4 0.000054664685 0.32 AML other m 2021-03-13T01:55:49.23
IV.SSFR.HHE. ML:1.8 0.0001469538 0.24 AML other m 2021-03-13T01:55:49.97
IV.SSFR.HNE. ML:1.9 0.00019769955 0.3104 AML other m 2021-03-13T01:55:50.24
IV.SSFR.HNN. ML:1.9 0.0001641941 0.8592 AML other m 2021-03-13T01:55:50.51
IV.SSFR.HHN. ML:1.9 0.0001905 0.18 AML other m 2021-03-13T01:55:50.82
IV.ATCC.EHE. ML:1.8 0.000144 0.32 AML other m 2021-03-13T01:55:51.70
IV.ARVD.HHE. ML:1.4 0.000041655855 0.28 AML other m 2021-03-13T01:55:53.83
IV.ARVD.HHN. ML:1.4 0.000047114675 0.3392 AML other m 2021-03-13T01:55:54.03
IV.MGAB.HHE. ML:1.6 0.000063303395 0.3808 AML other m 2021-03-13T01:55:55.13
IV.MGAB.HHN. ML:1.8 0.00011661426499999999 0.6592 AML other m 2021-03-13T01:55:55.48
IV.MGAB.HNN. ML:1.9 0.000139361775 0.6608 AML other m 2021-03-13T01:55:55.49
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