Earthquake with magnitude of ML 0.4 on date 14-08-2021 and time 02:21:55 (Italy) in region 6 km N Norcia (PG)

A magnitude ML 0.4 earthquake occured in region: 6 km N Norcia (PG), on

  • 14-08-2021 00:21:55 (UTC)
  • 14-08-2021 02:21:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.843, 13.088 at 12 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 6 4957 4957
Preci PG 6 724 5681
Castelsantangelo sul Nera MC 8 281 5962
Visso MC 10 1107 7069
Ussita MC 12 444 7513
Sellano PG 14 1079 8592
Cerreto di Spoleto PG 14 1075 9667
Cascia PG 15 3217 12884
Monte Cavallo MC 18 145 13029
Arquata del Tronto AP 19 1178 14207
Poggiodomo PG 19 117 14324

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
60 Km NW of L'Aquila (69753 inhabitants)
64 Km E of Perugia (166134 inhabitants)
93 Km SW of Ancona (100861 inhabitants)
93 Km NE of Viterbo (67173 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
101 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 0.4 2021-08-14
00:21:55
42.843 13.088 12 2021-08-14
00:26:39
Sala Sismica INGV-Roma 94109231
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-14 00:21:55 ± 0.08
Latitude 42.8430 ± 0.0036
Longitude 13.0880 ± 0.0049
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94109231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 373
Semi-minor axis of confidence ellipse (meter) 324
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 370
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 107
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.2626
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:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 94109231
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-14 00:26:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MURB.HHZ. 2021-08-14T00:22:09.89 3.0 negative manual P 1.56 0
IV.CSP1.EHZ. 2021-08-14T00:22:05.63 0.3 undecidable manual S 19 0.2626 92 0.01 72
IV.GAVE.EHZ. 2021-08-14T00:22:04.00 0.3 undecidable manual S 223 0.2068 93 0.03 73
IV.MMO1.EHZ. 2021-08-14T00:22:03.08 0.3 undecidable manual S 72 0.1835 94 -0.2 70
IV.CESI.HHZ. 2021-08-14T00:22:03.94 0.3 undecidable manual S 320 0.2104 93 -0.12 70
IV.FDMO.HHE. 2021-08-14T00:22:03.33 0.3 undecidable manual S 360 0.1934 94 -0.23 69
IV.CSP1.EHZ. 2021-08-14T00:22:01.29 1.0 negative manual P 19 0.2626 92 0 24
IV.MC2.EHZ. 2021-08-14T00:22:01.07 0.1 undecidable manual S 47 0.1007 118 0.18 96
IV.FDMO.HHE. 2021-08-14T00:22:00.29 0.1 undecidable manual P 360 0.1934 94 0.19 95
IV.CESI.HHZ. 2021-08-14T00:22:00.41 0.6 negative manual P 320 0.2104 93 0.02 48
IV.GAVE.EHZ. 2021-08-14T00:22:00.63 1.0 undecidable manual P 223 0.2068 93 0.29 23
IV.MMO1.EHZ. 2021-08-14T00:21:59.92 0.3 undecidable manual P 72 0.1835 94 -0.01 73
IV.NRCA.HHZ. 2021-08-14T00:21:59.21 0.1 undecidable manual S 116 0.0216 165 -0.22 97
IV.MC2.EHZ. 2021-08-14T00:21:58.69 0.3 undecidable manual P 47 0.1007 118 0.13 73
IV.NRCA.HHZ. 2021-08-14T00:21:57.78 0.1 undecidable manual P 116 0.0216 165 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:0.5 2.065E-5 1 AML other m 2021-08-14T00:22:04.77
IV.GAVE.EHE. ML:0.4 1.57E-5 0.28 AML other m 2021-08-14T00:22:04.52
IV.CESI.HHN. ML:0.5 1.895E-5 0.48 AML other m 2021-08-14T00:22:04.35
IV.CESI.HHE. ML:0.2 1.1135E-5 1.04 AML other m 2021-08-14T00:22:04.59
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