Earthquake with magnitude of ML 1.4 on date 18-08-2021 and time 04:47:26 (Italy) in region 3 km NE Norcia (PG)

A magnitude ML 1.4 earthquake occured in region: 3 km NE Norcia (PG), on

  • 18-08-2021 02:47:26 (UTC)
  • 18-08-2021 04:47:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.818, 13.112 at 5 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Norcia PG 3 4957 4957
Preci PG 9 724 5681
Castelsantangelo sul Nera MC 9 281 5962
Visso MC 13 1107 7069
Cascia PG 14 3217 10286
Ussita MC 14 444 10730
Cerreto di Spoleto PG 16 1075 11805
Arquata del Tronto AP 16 1178 12983
Sellano PG 17 1079 14062
Accumoli RI 18 667 14729
Montegallo AP 18 523 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
52 Km W of Teramo (54892 inhabitants)
57 Km NW of L'Aquila (69753 inhabitants)
67 Km E of Perugia (166134 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.4 2021-08-18
02:47:26
42.8182 13.112 5 2021-08-18
02:55:14
Sala Sismica INGV-Roma 94317721
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-18 02:47:26 ± 0.4
Latitude 42.8182 ± 0.0126
Longitude 13.1120 ± 0.0270
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94317721

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2146
Semi-minor axis of confidence ellipse (meter) 1007
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 299
Circular confidence region, given by single value of horizontal uncertainty (meter) 2150
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 172
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.52
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.41099
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 94317721
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-18 02:55:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-08-18T02:47:37.33 3.0 undecidable manual S -0.07 0
IV.SMA1.EHZ. 2021-08-18T02:47:36.29 0.3 undecidable manual S 139 0.2491 101 -0.28 70
IV.TERO.HHZ. 2021-08-18T02:47:36.27 0.1 undecidable manual P 118 0.411 96 0.27 90
IV.LNSS.HHZ. 2021-08-18T02:47:35.02 0.3 undecidable manual S 194 0.2212 102 -0.51 68
IV.MMO1.EHZ. 2021-08-18T02:47:34.52 0.3 undecidable manual S 63 0.1772 105 0.66 66
IV.RM33.EHZ. 2021-08-18T02:47:33.77 0.1 undecidable manual P 166 0.3184 98 -0.19 97
IV.LNSS.HHZ. 2021-08-18T02:47:32.69 0.1 undecidable manual P 194 0.2212 102 0.85 78
IV.SMA1.EHZ. 2021-08-18T02:47:32.77 0.3 undecidable manual P 139 0.2491 101 0.32 71
IV.MMO1.EHZ. 2021-08-18T02:47:30.06 0.1 undecidable manual P 63 0.1772 105 -0.82 83
IV.NRCA.HHZ. 2021-08-18T02:47:29.02 0.3 undecidable manual S 6 0.0153 162 0.33 77
IV.MC2.EHZ. 2021-08-18T02:47:29.17 0.1 undecidable manual P 31 0.1088 113 -0.28 100
IV.NRCA.HHZ. 2021-08-18T02:47:27.56 0.6 undecidable manual P 6 0.0153 162 -0.34 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.5 0.0001986286 0.32 AML other m 2021-08-18T02:47:35.36
IV.LNSS.HHN. ML:1.4 0.00016796615 0.16 AML other m 2021-08-18T02:47:35.38
IV.SMA1.EHE. ML:1.2 9.315E-5 0.2 AML other m 2021-08-18T02:47:36.81
IV.SMA1.EHN. ML:0.9 4.275281E-5 1.3408 AML other m 2021-08-18T02:47:38.73
IV.NRCA.HHE. ML:0 9.085664E-5 0.1584 AML other m 2021-08-18T02:47:29.22
IV.NRCA.HHN. ML:0 7.1193315E-5 0.1008 AML other m 2021-08-18T02:47:29.09
IV.NRCA.HNE. ML:0 0.000130127155 0.6 AML other m 2021-08-18T02:47:30.61
IV.NRCA.HNN. ML:0 0.00021604145 0.8592 AML other m 2021-08-18T02:47:29.16
IV.LNSS.HNE. ML:1.5 0.00019457198 0.32 AML other m 2021-08-18T02:47:35.36
IV.LNSS.HNN. ML:1.7 0.00029678215 1.4304 AML other m 2021-08-18T02:47:37.17
IV.RM33.HNE. ML:1.6 0.00014979645 1.2992 AML other m 2021-08-18T02:47:37.60
IV.RM33.HNN. ML:1.6 0.00015624165 1.3008 AML other m 2021-08-18T02:47:50.48
IV.RM33.EHE. ML:0.9 2.883354E-5 0.2208 AML other m 2021-08-18T02:47:37.66
IV.RM33.EHN. ML:0.9 3.0006835E-5 0.44 AML other m 2021-08-18T02:47:37.24
IV.TERO.HHE. ML:2.1 0.0004131244 0.5984 AML other m 2021-08-18T02:47:57.39
IV.TERO.HHN. ML:1 3.0873615E-5 1.44 AML other m 2021-08-18T02:47:51.92
IV.TERO.HNE. ML:1.6 0.0001282167 1.0592 AML other m 2021-08-18T02:47:48.24
IV.TERO.HNN. ML:1.8 0.0001731098 1.0496 AML other m 2021-08-18T02:47:47.02
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