Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 10-08-2021 and time 14:12:15 (Italy) in region 4 km S Preci (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km S Preci (PG), on

  • 10-08-2021 12:12:15 (UTC)
  • 10-08-2021 14:12:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8430, 13.0340 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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 7 4957 5681
Cerreto di Spoleto PG 10 1075 6756
Sellano PG 10 1079 7835
Visso MC 11 1107 8942
Castelsantangelo sul Nera MC 11 281 9223
Cascia PG 14 3217 12440
Ussita MC 14 444 12884
Vallo di Nera PG 16 364 13248
Poggiodomo PG 17 117 13365
Monte Cavallo MC 17 145 13510

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
58 Km W of Teramo (54892 inhabitants)
60 Km E 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)
98 Km W of Montesilvano (53738 inhabitants)
100 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
Reviewed
Rev100 		ML 1.0 2021-08-10
12:12:15		 42.8427 13.0342 10 2021-08-10
12:20:10		 Sala Sismica INGV-Roma 93921511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-10 12:12:15 ± 0.06
Latitude 42.8427 ± 0.0045
Longitude 13.0342 ± 0.0074
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93921511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 673
Semi-minor axis of confidence ellipse (meter) 259
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 126
Circular confidence region, given by single value of horizontal uncertainty (meter) 670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 136
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.27879
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 93921511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-10 12:20:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-08-10T12:12:26.01 0.3 undecidable manual S 27 30.9468 50 -0.02 72
IV.MML1.EHZ. 2021-08-10T12:12:26.00 0.3 undecidable manual S 350 30.4473 50 0.09 71
IV.VCEL.EHZ. 2021-08-10T12:12:26.72 3.0 undecidable manual P -0.01 0
IV.FDMO.HHZ. 2021-08-10T12:12:23.31 0.3 undecidable manual S 11 21.9669 114 -0.08 73
IV.GAVE.EHZ. 2021-08-10T12:12:22.80 0.3 undecidable manual S 214 20.1687 116 -0.05 73
IV.CSP1.EHZ. 2021-08-10T12:12:21.33 0.6 positive manual P 27 30.9468 50 -0.06 48
IV.MC2.EHZ. 2021-08-10T12:12:21.39 0.3 undecidable manual S 59 14.6742 124 0.2 72
IV.MML1.EHZ. 2021-08-10T12:12:21.15 0.1 undecidable manual P 350 30.4473 50 -0.17 93
IV.FDMO.HHZ. 2021-08-10T12:12:19.94 0.3 positive manual P 11 21.9669 114 0.08 72
IV.GAVE.EHZ. 2021-08-10T12:12:19.68 0.1 undecidable manual P 214 20.1687 116 0.13 96
IV.NRCA.HHZ. 2021-08-10T12:12:18.87 0.3 undecidable manual S 99 6.5934 146 -0.29 71
IV.MC2.EHZ. 2021-08-10T12:12:18.89 1.0 undecidable manual P 59 14.6742 124 0.3 23
IV.NRCA.HHZ. 2021-08-10T12:12:17.46 0.1 undecidable manual P 99 6.5934 146 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.0002528392 0.0832 AML other m 2021-08-10T12:12:18.92
IV.NRCA.HHE. ML:1.1 0.00020468545 0.0768 AML other m 2021-08-10T12:12:19.33
IV.GAVE.EHN. ML:0.9 0.00006154999999999999 0.1 AML other m 2021-08-10T12:12:23.41
IV.FDMO.HHE. ML:1.0 0.00006025 0.26 AML other m 2021-08-10T12:12:23.52
IV.GAVE.EHE. ML:1.0 0.00006336883 0.224 AML other m 2021-08-10T12:12:23.68
IV.FDMO.HHN. ML:0.7 0.00003705 0.6 AML other m 2021-08-10T12:12:23.49
IV.CSP1.EHE. ML:0.9 0.00004244195 0.1792 AML other m 2021-08-10T12:12:26.21
IV.CSP1.EHN. ML:1.1 0.000052942913 0.2816 AML other m 2021-08-10T12:12:27.64
IV.NRCA.HNE. ML:1.1 0.00020721875000000002 0.0896 AML other m 2021-08-10T12:12:19.33
IV.NRCA.HNN. ML:1.2 0.00022315522500000002 0.0832 AML other m 2021-08-10T12:12:18.92
IV.MML1.EHE. ML:0.6 0.000017580305 0.1024 AML other m 2021-08-10T12:12:27.03
IV.MML1.EHN. ML:0.6 0.000021205065000000002 0.2048 AML other m 2021-08-10T12:12:26.87
IV.VCEL.EHN. ML:1.1 0.000015114820000000001 0.3392 AML other m 2021-08-10T12:12:35.26
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