Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 08-08-2021 and time 04:46:42 (Italy) in region 4 km S Preci (PG)

A magnitude ML 1.5 earthquake occured in region: 4 km S Preci (PG), on

  • 08-08-2021 02:46:42 (UTC)
  • 08-08-2021 04:46:42 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8420, 13.0290 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
Preci PG 4 724 724
Norcia PG 8 4957 5681
Cerreto di Spoleto PG 9 1075 6756
Sellano PG 10 1079 7835
Visso MC 11 1107 8942
Castelsantangelo sul Nera MC 12 281 9223
Cascia PG 14 3217 12440
Ussita MC 15 444 12884
Vallo di Nera PG 16 364 13248
Poggiodomo PG 16 117 13365
Monte Cavallo MC 17 145 13510
Sant'Anatolia di Narco PG 20 564 14074

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
59 Km W of Teramo (54892 inhabitants)
60 Km SE of Perugia (166134 inhabitants)
62 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
97 Km N of Guidonia Montecelio (88673 inhabitants)
99 Km W of Montesilvano (53738 inhabitants)
99 Km N of Tivoli (56533 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 1.5 2021-08-08
02:46:42		 42.8418 13.0293 8 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97816221
Reviewed
Rev100 		ML 1.6 2021-08-08
02:46:42		 42.8427 13.0407 9 2021-08-08
02:59:09		 Sala Sismica INGV-Roma 93819941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-08 02:46:42 ± 0.04
Latitude 42.8418 ± 0.0018
Longitude 13.0293 ± 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 97816221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 288
Semi-minor axis of confidence ellipse (meter) 180
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 83
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 43
Number of associated phases, regardless of their use for origin computation 41
Number of defining phases 36
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.44606
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 93819941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-08 02:59:09

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 97816221
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-26 11:45:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.BSSO.HHZ. 2021-08-08T02:47:38.37 3.0 undecidable manual Sn -0.05 0
IV.MCIV.CHZ. 2021-08-08T02:47:17.09 3.0 undecidable manual S -0.44 0
IV.CRTC.HHZ. 2021-08-08T02:47:13.27 3.0 undecidable manual S -4.67 0
IV.CPGN.EHZ. 2021-08-08T02:47:05.74 3.0 undecidable manual P 0.91 0
IV.ATCC.EHZ. 2021-08-08T02:46:59.39 0.3 undecidable manual S 320 49.5171 50 0.28 67
IV.CESX.HHE. 2021-08-08T02:46:57.79 0.3 undecidable manual S 234 44.4222 50 0.03 72
IV.RM33.EHZ. 2021-08-08T02:46:56.06 0.3 undecidable manual S 158 39.9267 50 -0.5 65
IV.MF5.EHZ. 2021-08-08T02:46:56.87 0.3 undecidable manual S 65 38.5281 50 0.68 61
IV.GUMA.HHZ. 2021-08-08T02:46:55.36 0.3 undecidable manual S 45 34.8429 50 0.14 71
IV.ASSB.HHZ. 2021-08-08T02:46:55.77 0.3 undecidable manual S 307 37.4292 50 -0.13 71
IV.ARRO.EHZ. 2021-08-08T02:46:55.74 0.6 undecidable manual S 216 36.2415 50 0.16 47
IV.T1299.HNN. 2021-08-08T02:46:54.13 0.3 undecidable manual S 138 30.9468 105 0.18 71
IV.CSP1.EHZ. 2021-08-08T02:46:53.93 0.3 undecidable manual S 27 31.1466 105 -0.1 72
IV.MNTT.EHZ. 2021-08-08T02:46:53.39 3.0 positive manual Pg -0.55 0
IV.MML1.HNE. 2021-08-08T02:46:53.90 0.3 undecidable manual S 351 30.4473 105 0.09 72
IV.LNSS.HNZ. 2021-08-08T02:46:52.59 0.3 undecidable manual S 178 26.5512 107 0.1 73
IV.CESX.HHE. 2021-08-08T02:46:51.52 0.6 undecidable manual P 234 44.4222 50 0.06 47
IV.ATCC.EHZ. 2021-08-08T02:46:51.99 0.1 undecidable manual P 320 49.5171 50 -0.25 91
IV.CESI.HNZ. 2021-08-08T02:46:50.75 0.3 undecidable manual S 331 20.7681 112 0.16 73
IV.FDMO.HHZ. 2021-08-08T02:46:50.86 0.3 undecidable manual S 12 22.0668 111 -0.17 72
IV.RM33.EHZ. 2021-08-08T02:46:50.45 0.3 undecidable manual P 158 39.9267 50 -0.31 68
IV.GAVE.HNZ. 2021-08-08T02:46:50.77 0.3 undecidable manual S 214 19.9689 113 0.44 69
IV.MOMA.HNZ. 2021-08-08T02:46:50.47 0.6 undecidable manual P 264 37.629 50 0.06 48
IV.MF5.EHZ. 2021-08-08T02:46:50.88 0.3 undecidable manual P 65 38.5281 50 0.33 68
IV.ARRO.EHZ. 2021-08-08T02:46:49.88 0.6 undecidable manual P 216 36.2415 50 -0.31 46
IV.MML1.HNE. 2021-08-08T02:46:49.01 0.3 undecidable manual P 351 30.4473 105 -0.16 71
IV.CSP1.EHZ. 2021-08-08T02:46:49.24 0.3 undecidable manual P 27 31.1466 105 -0.06 73
IV.T1299.HNN. 2021-08-08T02:46:49.19 0.3 undecidable manual P 138 30.9468 105 -0.06 73
IV.GUMA.HHZ. 2021-08-08T02:46:49.89 0.3 undecidable manual P 45 34.8429 50 -0.1 72
IT.MTCL.HGZ. 2021-08-08T02:46:49.31 0.3 undecidable manual S 352 17.0718 116 -0.11 74
IV.ASSB.HHZ. 2021-08-08T02:46:49.95 0.3 undecidable manual P 307 37.4292 50 -0.43 67
IV.LNSS.HNZ. 2021-08-08T02:46:48.36 0.1 undecidable manual P 178 26.5512 107 -0.05 98
IV.FEMA.HNZ. 2021-08-08T02:46:48.57 0.6 undecidable manual S 7 13.4754 122 0.25 48
IV.CESI.HNZ. 2021-08-08T02:46:47.27 0.1 undecidable manual P 331 20.7681 112 -0.05 99
IV.FDMO.HHZ. 2021-08-08T02:46:47.46 0.1 undecidable manual P 12 22.0668 111 -0.11 98
IV.GAVE.HNZ. 2021-08-08T02:46:47.46 0.3 undecidable manual P 214 19.9689 113 0.29 71
IT.MTCL.HGZ. 2021-08-08T02:46:46.63 0.3 undecidable manual P 352 17.0718 116 -0.01 75
IV.FEMA.HNZ. 2021-08-08T02:46:46.25 0.3 undecidable manual P 7 13.4754 122 0.24 72
IV.MC2.EHZ. 2021-08-08T02:46:46.48 0.1 undecidable manual P 59 15.0738 119 0.19 97
IV.NRCA.HHZ. 2021-08-08T02:46:46.21 0.3 undecidable manual S 98 6.993 140 -0.4 71
IV.NRCA.HHZ. 2021-08-08T02:46:44.89 0.1 positive manual P 98 6.993 140 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.6 0.0006573252499999999 0.1008 AML other m 2021-08-08T02:46:46.77
IV.NRCA.HNN. ML:1.5 0.000624 0.12 AML other m 2021-08-08T02:46:46.77
IV.NRCA.HNE. ML:1.7 0.000985648 0.12 AML other m 2021-08-08T02:46:47.57
IV.NRCA.HHE. ML:1.8 0.0010613521 0.1216 AML other m 2021-08-08T02:46:47.57
IV.FDMO.HHN. ML:1.4 0.00016900000000000002 0.82 AML other m 2021-08-08T02:46:51.12
IV.FDMO.HHE. ML:1.5 0.0002315 0.26 AML other m 2021-08-08T02:46:51.40
IV.CSP1.EHN. ML:1.6 0.00017679500000000002 0.2592 AML other m 2021-08-08T02:46:55.28
IV.CSP1.EHE. ML:1.6 0.0002082484 0.2208 AML other m 2021-08-08T02:46:55.80
IV.GUMA.HHE. ML:1.7 0.00021331345 0.3392 AML other m 2021-08-08T02:46:56.90
IV.GUMA.HHN. ML:1.7 0.00020142925000000002 0.36 AML other m 2021-08-08T02:46:57.70
IV.ASSB.HHE. ML:1.0 0.000036843470000000005 0.2992 AML other m 2021-08-08T02:46:58.41
IV.RM33.EHE. ML:1.2 0.000050563474999999996 0.2384 AML other m 2021-08-08T02:46:59.93
IV.ASSB.HHN. ML:1.0 0.000038717135 0.16 AML other m 2021-08-08T02:46:58.26
IV.RM33.EHN. ML:1.1 0.00004063832000000001 0.2192 AML other m 2021-08-08T02:46:58.29
IV.GUMA.HNE. ML:1.7 0.00020478009999999998 0.36 AML other m 2021-08-08T02:46:57.91
IV.GUMA.HNN. ML:1.7 0.00022050815 0.2896 AML other m 2021-08-08T02:46:58.16
IV.MF5.EHE. ML:1.1 0.00004979372 0.3008 AML other m 2021-08-08T02:46:58.33
IV.MF5.EHN. ML:1.0 0.00003615057 0.2192 AML other m 2021-08-08T02:46:58.21
IV.ATCC.EHN. ML:1.0 0.00002820823 0.4 AML other m 2021-08-08T02:46:59.82
IV.ATCC.EHE. ML:1.2 0.000044499009999999996 0.32 AML other m 2021-08-08T02:47:01.43
IV.MNTT.EHE. ML:1.9 0.000185603965 0.16 AML other m 2021-08-08T02:47:03.08
IV.MNTT.EHN. ML:1.6 0.00009953960364999999 0.28 AML other m 2021-08-08T02:47:03.05
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