Earthquake with magnitude of ML 0.4 on date 13-08-2021 and time 05:43:10 (Italy) in region 4 km NW Norcia (PG)

A magnitude ML 0.4 earthquake occured in region: 4 km NW Norcia (PG), on

  • 13-08-2021 03:43:10 (UTC)
  • 13-08-2021 05:43:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.816, 13.064 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.

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 4 4957 4957
Preci PG 7 724 5681
Cascia PG 12 3217 8898
Castelsantangelo sul Nera MC 12 281 9179
Cerreto di Spoleto PG 12 1075 10254
Visso MC 13 1107 11361
Sellano PG 14 1079 12440
Poggiodomo PG 16 117 12557
Ussita MC 16 444 13001
Vallo di Nera PG 17 364 13365
Arquata del Tronto AP 20 1178 14543

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
55 Km W of Teramo (54892 inhabitants)
58 Km NW of L'Aquila (69753 inhabitants)
64 Km SE of Perugia (166134 inhabitants)
90 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
95 Km W of Montesilvano (53738 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
97 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2021-08-13
03:43:10
42.816 13.0638 10 2021-08-13
03:49:17
Sala Sismica INGV-Roma 94053911
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-13 03:43:10 ± 0.09
Latitude 42.8160 ± 0.0027
Longitude 13.0638 ± 0.0074
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94053911

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 563
Semi-minor axis of confidence ellipse (meter) 225
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 560
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 120
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.29408
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 94053911
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-13 03:49:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
MN.BLY.HHZ. 2021-08-13T03:45:02.85 3.0 undecidable manual Sg 16.450001 0
IV.MILN.HNZ. 2021-08-13T03:44:53.10 3.0 undecidable manual Sn -0.87 0
IX.MNT3.EHZ.02 2021-08-13T03:44:21.67 3.0 undecidable manual Sg 4.53 0
CR.STON.BHZ. 2021-08-13T03:44:15.54 3.0 negative manual Pg 14.28 0
OT.OT11.EHZ. 2021-08-13T03:44:09.71 3.0 undecidable manual Sn 0.14 0
IV.TREG.EHZ. 2021-08-13T03:43:58.96 3.0 positive manual Pn 1.79 0
IV.LPEL.HHZ. 2021-08-13T03:43:44.11 3.0 undecidable manual S -0.9 0
IV.LPEL.HHZ. 2021-08-13T03:43:29.21 3.0 positive manual P -0.09 0
IV.CSP1.EHZ. 2021-08-13T03:43:21.75 0.6 undecidable manual S 20 0.2941 50 -0.04 49
IV.CESI.HHZ. 2021-08-13T03:43:19.49 0.6 undecidable manual S 328 0.2221 112 -0.04 49
IV.LNSS.HNZ. 2021-08-13T03:43:19.04 0.3 undecidable manual S 185 0.214 112 -0.2 72
IV.FDMO.HHZ. 2021-08-13T03:43:19.25 0.3 undecidable manual S 4 0.2212 112 -0.25 71
IV.MC2.EHZ. 2021-08-13T03:43:16.66 0.3 undecidable manual S 44 0.1322 124 0.2 73
IV.CSP1.EHZ. 2021-08-13T03:43:16.81 1.0 negative manual P 20 0.2941 50 -0.14 24
IV.LNSS.HNZ. 2021-08-13T03:43:15.37 0.3 undecidable manual P 185 0.214 112 -0.11 73
IV.FDMO.HHZ. 2021-08-13T03:43:15.52 0.6 positive manual P 4 0.2212 112 -0.11 49
IV.CESI.HHZ. 2021-08-13T03:43:15.78 0.6 positive manual P 328 0.2221 112 0.13 48
IV.MC2.EHZ. 2021-08-13T03:43:14.08 0.6 positive manual P 44 0.1322 124 0.21 49
IV.GAVE.EHE. 2021-08-13T03:43:14.93 0.1 undecidable manual P 225 0.1754 117 0.22 96
IV.NRCA.HHZ. 2021-08-13T03:43:13.94 0.1 undecidable manual S 65 0.0405 155 -0.14 100
IV.NRCA.HHZ. 2021-08-13T03:43:12.66 0.1 undecidable manual P 65 0.0405 155 0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.5 0.0006115 0.08 AML other m 2021-08-13T03:43:14.01
IV.NRCA.HNN. ML:1.5 0.000536 0.08 AML other m 2021-08-13T03:43:14.01
IV.NRCA.HNE. ML:1.2 0.000302 0.16 AML other m 2021-08-13T03:43:14.15
IV.NRCA.HHE. ML:1.3 0.0003145 0.18 AML other m 2021-08-13T03:43:14.06
IV.CESI.HHN. ML:0.6 2.66E-5 1.58 AML other m 2021-08-13T03:43:19.19
IV.FDMO.HHN. ML:0.2 8.72E-6 1.46 AML other m 2021-08-13T03:43:20.87
IV.CESI.HHE. ML:0.4 1.49E-5 1.04 AML other m 2021-08-13T03:43:20.35
IV.FDMO.HHE. ML:0.2 8.01E-6 0.52 AML other m 2021-08-13T03:43:21.53
OT.OT11.EHE. ML:2.8 0.0001388 0.6 AML other m 2021-08-13T03:44:09.96
OT.OT11.EHN. ML:3 0.0001975 1.56 AML other m 2021-08-13T03:44:17.84
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