Earthquake with magnitude of ML 0.8 on date 30-03-2021 and time 20:47:11 (Italy) in region 4 km NW Arquata del Tronto (AP)

A magnitude ML 0.8 earthquake occured in region: 4 km NW Arquata del Tronto (AP), on

  • 30-03-2021 18:47:11 (UTC)
  • 30-03-2021 20:47:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.793, 13.258 at 15 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 4 1178 1178
Montegallo AP 8 523 1701
Accumoli RI 11 667 2368
Acquasanta Terme AP 13 2916 5284
Montemonaco AP 13 604 5888
Norcia PG 13 4957 10845
Castelsantangelo sul Nera MC 14 281 11126
Montefortino FM 18 1178 12304
Amatrice RI 18 2657 14961
Roccafluvione AP 19 2010 16971
Ussita MC 20 444 17415

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km W of Teramo (54892 inhabitants)
49 Km E of Foligno (57155 inhabitants)
50 Km N of L'Aquila (69753 inhabitants)
56 Km E of Terni (111501 inhabitants)
79 Km E of Perugia (166134 inhabitants)
79 Km W of Montesilvano (53738 inhabitants)
86 Km W of Pescara (121014 inhabitants)
89 Km NW of Chieti (51815 inhabitants)
94 Km S of Ancona (100861 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 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 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 0.8 2021-03-30
18:47:11
42.7927 13.2582 15 2021-03-30
18:57:14
Sala Sismica INGV-Roma 88623441
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-30 18:47:11 ± 0.15
Latitude 42.7927 ± 0.0045
Longitude 13.2582 ± 0.0061
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88623441

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 583
Semi-minor axis of confidence ellipse (meter) 252
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 237
Circular confidence region, given by single value of horizontal uncertainty (meter) 580
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.10792
Epicentral distance of station farthest from the epicenter (degree) 0.30577
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:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 88623441
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-30 18:57:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-03-30T18:47:23.00 0.3 undecidable manual S 124 0.3058 101 -0.01 72
IV.CSP1.EHZ. 2021-03-30T18:47:22.88 0.3 undecidable manual S 353 0.3013 101 -0.01 72
IV.FDMO.HHZ. 2021-03-30T18:47:21.84 0.3 undecidable manual S 333 0.2743 103 -0.25 69
IV.SMA1.EHZ. 2021-03-30T18:47:19.55 0.3 undecidable manual S 161 0.1718 116 0.32 69
IV.TERO.HHZ. 2021-03-30T18:47:18.06 0.1 undecidable manual P 124 0.3058 101 -0.04 96
IV.MC2.EHZ. 2021-03-30T18:47:18.40 0.3 undecidable manual S 337 0.1286 126 0.25 71
IV.CSP1.EHZ. 2021-03-30T18:47:18.23 0.3 undecidable manual P 353 0.3013 101 0.19 70
IV.NRCA.HHZ. 2021-03-30T18:47:17.66 0.3 undecidable manual S 291 0.1133 131 -0.12 73
IV.MMO1.HNZ. 2021-03-30T18:47:17.71 0.3 undecidable manual S 25 0.1178 130 -0.17 72
IV.FDMO.HHZ. 2021-03-30T18:47:17.42 0.3 undecidable manual P 333 0.2743 103 -0.15 71
IV.MTRA.EHZ. 2021-03-30T18:47:17.58 0.3 undecidable manual S 109 0.1079 133 -0.08 74
IV.SMA1.EHZ. 2021-03-30T18:47:15.46 0.3 undecidable manual P 161 0.1718 116 -0.46 68
IV.MTRA.EHZ. 2021-03-30T18:47:15.11 0.1 undecidable manual P 109 0.1079 133 0.1 98
IV.MC2.EHZ. 2021-03-30T18:47:15.46 0.1 undecidable manual P 337 0.1286 126 0.17 97
IV.NRCA.HHZ. 2021-03-30T18:47:15.14 0.1 undecidable manual P 291 0.1133 131 0.06 99
IV.MMO1.HNZ. 2021-03-30T18:47:15.13 0.1 undecidable manual P 25 0.1178 130 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1 8.195E-5 0.22 AML other m 2021-03-30T18:47:17.82
IV.MTRA.EHN. ML:0.7 4.75E-5 0.6 AML other m 2021-03-30T18:47:17.69
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