Earthquake with magnitude of ML 0.4 on date 26-03-2021 and time 06:40:27 (Italy) in region 6 km E Norcia (PG)

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

  • 26-03-2021 05:40:27 (UTC)
  • 26-03-2021 06:40:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.788, 13.171 at 11 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
Arquata del Tronto AP 11 1178 6135
Castelsantangelo sul Nera MC 12 281 6416
Accumoli RI 12 667 7083
Montegallo AP 15 523 7606
Preci PG 15 724 8330
Cascia PG 15 3217 11547
Visso MC 17 1107 12654
Ussita MC 18 444 13098
Montemonaco AP 18 604 13702
Cittareale RI 19 482 14184
Acquasanta Terme AP 20 2916 17100
Amatrice RI 20 2657 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
50 Km NE of Terni (111501 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
73 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
93 Km W of Pescara (121014 inhabitants)
95 Km NE of Guidonia Montecelio (88673 inhabitants)
95 Km NW of Chieti (51815 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
97 Km NE 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 2021-03-26
05:40:27
42.7882 13.1708 11 2021-03-26
07:51:13
Sala Sismica INGV-Roma 88482981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-26 05:40:27 ± 0.04
Latitude 42.7882 ± 0.0027
Longitude 13.1708 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88482981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 339
Semi-minor axis of confidence ellipse (meter) 236
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.35883
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 88482981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-26 07:51:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-03-26T05:40:40.23 0.6 undecidable manual S 117 0.3588 50 -0.22 46
IV.CESI.HHZ. 2021-03-26T05:40:38.38 0.6 undecidable manual S 318 0.2914 50 -0.08 48
IV.FDMO.HHZ. 2021-03-26T05:40:37.26 0.6 undecidable manual S 346 0.2554 50 -0.14 48
IV.GAVE.EHZ. 2021-03-26T05:40:36.50 0.6 undecidable manual S 245 0.2248 50 0.02 49
IV.LNSS.HHZ. 2021-03-26T05:40:36.15 0.6 undecidable manual S 207 0.2086 50 0.14 48
IV.T1299.HNZ. 2021-03-26T05:40:35.10 0.6 undecidable manual S 152 0.1745 119 0.16 48
IV.TERO.HHZ. 2021-03-26T05:40:35.16 0.6 undecidable manual P 117 0.3588 50 0.28 45
IV.MMO1.EHZ. 2021-03-26T05:40:34.48 0.6 undecidable manual S 46 0.1592 121 0.04 49
IV.FDMO.HHZ. 2021-03-26T05:40:33.11 1.0 undecidable manual P 346 0.2554 50 -0.01 24
IV.CESI.HHZ. 2021-03-26T05:40:33.75 0.6 undecidable manual P 318 0.2914 50 0.01 48
IV.MC2.EHZ. 2021-03-26T05:40:33.28 0.6 undecidable manual S 6 0.1241 128 -0.04 50
IV.LNSS.HHZ. 2021-03-26T05:40:32.36 0.1 undecidable manual P 207 0.2086 50 0.04 98
IV.GAVE.EHZ. 2021-03-26T05:40:32.58 1.0 undecidable manual P 245 0.2248 50 -0.01 25
IV.MMO1.EHZ. 2021-03-26T05:40:31.57 0.6 undecidable manual P 46 0.1592 121 0.15 48
IV.T1299.HNZ. 2021-03-26T05:40:31.40 0.1 undecidable manual P 152 0.1745 119 -0.3 93
IV.NRCA.HHZ. 2021-03-26T05:40:31.47 0.6 undecidable manual S 318 0.0612 147 -0.2 49
IV.MC2.EHZ. 2021-03-26T05:40:30.89 0.1 undecidable manual P 6 0.1241 128 0.13 98
IV.NRCA.HHZ. 2021-03-26T05:40:29.89 0.1 positive manual P 318 0.0612 147 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1 0.000157 0.7 AML other m 2021-03-26T05:40:31.46
IV.NRCA.HHN. ML:1 0.0001295 0.1 AML other m 2021-03-26T05:40:31.93
IV.CESI.HHN. ML:0.8 2.62E-5 0.28 AML other m 2021-03-26T05:40:38.57
IV.CESI.HHE. ML:0.5 1.685E-5 0.4 AML other m 2021-03-26T05:40:38.55
IV.GAVE.EHE. ML:0.6 2.25726E-5 0.1792 AML other m 2021-03-26T05:40:38.27
IV.GAVE.EHN. ML:0.5 1.8700186E-5 0.2208 AML other m 2021-03-26T05:40:37.18
IV.FDMO.HHE. ML:0 5.940827E-6 0.2176 AML other m 2021-03-26T05:40:38.32
IV.FDMO.HHN. ML:0 7.163358E-6 0.2016 AML other m 2021-03-26T05:40:38.37
IV.TERO.HHE. ML:0.2 5.7544845E-6 0.08 AML other m 2021-03-26T05:40:41.21
IV.TERO.HHN. ML:0.2 6.4336775E-6 0.0576 AML other m 2021-03-26T05:40:41.47
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