Earthquake with magnitude of ML 0.6 on date 01-04-2021 and time 08:39:30 (Italy) in region 7 km W Arquata del Tronto (AP)

A magnitude ML 0.6 earthquake occured in region: 7 km W Arquata del Tronto (AP), on

  • 01-04-2021 06:39:30 (UTC)
  • 01-04-2021 08:39:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.784, 13.207 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
Arquata del Tronto AP 8 1178 1178
Norcia PG 9 4957 6135
Accumoli RI 10 667 6802
Montegallo AP 12 523 7325
Castelsantangelo sul Nera MC 13 281 7606
Montemonaco AP 16 604 8210
Acquasanta Terme AP 17 2916 11126
Cascia PG 17 3217 14343
Preci PG 17 724 15067
Amatrice RI 18 2657 17724
Ussita MC 19 444 18168
Cittareale RI 19 482 18650
Visso MC 19 1107 19757

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km W of Teramo (54892 inhabitants)
45 Km E of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
52 Km E of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
83 Km W of Montesilvano (53738 inhabitants)
90 Km W of Pescara (121014 inhabitants)
92 Km NW of Chieti (51815 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
96 Km S of Ancona (100861 inhabitants)
97 Km NE of Tivoli (56533 inhabitants)
99 Km E of Viterbo (67173 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 0.6 2021-04-01
06:39:30
42.784 13.2073 10 2021-04-01
06:51:21
Sala Sismica INGV-Roma 88666251
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-01 06:39:30 ± 0.09
Latitude 42.7840 ± 0.0063
Longitude 13.2073 ± 0.0086
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 88666251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 824
Semi-minor axis of confidence ellipse (meter) 388
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 44
Circular confidence region, given by single value of horizontal uncertainty (meter) 820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 15
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.08454
Epicentral distance of station farthest from the epicenter (degree) 0.33275
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.2
Num. used stations 7
Type of magnitude ML
Reference to an origin 88666251
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-01 06:51:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-04-01T06:39:42.23 0.6 undecidable manual S 119 0.3327 50 -0.5 44
IV.CSP1.EHZ. 2021-04-01T06:39:41.80 0.6 undecidable manual S 360 0.3076 50 -0.18 47
IV.GAVE.EHZ. 2021-04-01T06:39:40.15 0.6 undecidable manual S 248 0.2473 50 -0.05 49
IV.FDMO.HHZ. 2021-04-01T06:39:40.11 0.6 undecidable manual S 341 0.2671 50 -0.67 41
IV.CSP1.EHZ. 2021-04-01T06:39:37.21 0.3 undecidable manual P 360 0.3076 50 0.21 70
IV.TERO.HHZ. 2021-04-01T06:39:37.46 0.3 undecidable manual P 119 0.3327 50 0.03 72
IV.GAVE.EHZ. 2021-04-01T06:39:36.25 0.3 undecidable manual P 248 0.2473 50 0.28 70
IV.FDMO.HHZ. 2021-04-01T06:39:36.71 0.3 undecidable manual P 341 0.2671 50 0.4 68
IV.MC2.EHZ. 2021-04-01T06:39:36.28 0.6 undecidable manual S 354 0.1277 126 0.02 50
IV.MTRA.HNE. 2021-04-01T06:39:36.38 0.6 undecidable manual S 101 0.1412 123 -0.31 47
IV.NRCA.HHZ. 2021-04-01T06:39:34.61 0.3 undecidable manual S 306 0.0845 137 -0.38 71
IV.SMA1.EHZ. 2021-04-01T06:39:34.57 0.1 undecidable manual P 148 0.1799 117 -0.12 98
IV.MTRA.HNE. 2021-04-01T06:39:34.30 0.1 undecidable manual P 101 0.1412 123 0.36 94
IV.MC2.EHZ. 2021-04-01T06:39:33.96 0.1 undecidable manual P 354 0.1277 126 0.26 96
IV.NRCA.HHZ. 2021-04-01T06:39:32.87 0.1 undecidable manual P 306 0.0845 137 -0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0 0.0003515 0.16 AML other m 2021-04-01T06:39:34.78
IV.NRCA.HNE. ML:0 0.0003575 1.32 AML other m 2021-04-01T06:39:34.87
IV.NRCA.HHN. ML:0 0.0005215 0.1 AML other m 2021-04-01T06:39:34.87
IV.NRCA.HNN. ML:0 0.0004835 0.1 AML other m 2021-04-01T06:39:34.88
IV.TERO.HHN. ML:0.6 1.265E-5 0.12 AML other m 2021-04-01T06:39:43.29
IV.TERO.HHE. ML:0.4 1.0275E-5 1.22 AML other m 2021-04-01T06:39:43.37
IV.GAVE.EHE. ML:0.7 2.6311395E-5 0.2016 AML other m 2021-04-01T06:39:42.45
IV.GAVE.EHN. ML:0.6 2.05617085E-5 0.1184 AML other m 2021-04-01T06:39:40.69
IV.GAVE.HNE. ML:0.9 3.8940845E-5 0.6304 AML other m 2021-04-01T06:39:40.16
IV.CSP1.EHE. ML:0.6 1.6033274E-5 0.7008 AML other m 2021-04-01T06:39:42.16
IV.CSP1.EHN. ML:0.4 1.1492945E-5 0.7808 AML other m 2021-04-01T06:39:42.15
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