Earthquake with magnitude of ML 0.8 on date 04-03-2021 and time 03:01:30 (Italy) in region 5 km W Arquata del Tronto (AP)

A magnitude ML 0.8 earthquake occured in region: 5 km W Arquata del Tronto (AP), on

  • 04-03-2021 02:01:30 (UTC)
  • 04-03-2021 03:01:30 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.781, 13.243 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
Arquata del Tronto AP 5 1178 1178
Accumoli RI 10 667 1845
Montegallo AP 10 523 2368
Norcia PG 12 4957 7325
Acquasanta Terme AP 14 2916 10241
Castelsantangelo sul Nera MC 15 281 10522
Montemonaco AP 15 604 11126
Amatrice RI 17 2657 13783
Cittareale RI 19 482 14265
Montefortino FM 20 1178 15443
Preci PG 20 724 16167
Cascia PG 20 3217 19384

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km W of Teramo (54892 inhabitants)
48 Km E of Foligno (57155 inhabitants)
49 Km N of L'Aquila (69753 inhabitants)
55 Km E of Terni (111501 inhabitants)
78 Km E of Perugia (166134 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
90 Km NW of Chieti (51815 inhabitants)
96 Km S of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 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 2021-03-04
02:01:30
42.7813 13.2433 11 2021-03-04
02:07:49
Sala Sismica INGV-Roma 87692211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-04 02:01:30 ± 0.2
Latitude 42.7813 ± 0.0099
Longitude 13.2433 ± 0.0098
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87692211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1179
Semi-minor axis of confidence ellipse (meter) 652
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 202
Circular confidence region, given by single value of horizontal uncertainty (meter) 1180
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 197
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.10792
Epicentral distance of station farthest from the epicenter (degree) 0.27969
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 87692211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-03-04 02:07:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-03-04T02:01:40.63 0.1 undecidable manual S 336 0.2797 50 -0.33 91
IV.MF5.EHZ. 2021-03-04T02:01:40.90 0.1 undecidable manual S 37 0.2599 50 0.51 88
IV.FDMO.HHZ. 2021-03-04T02:01:36.01 0.1 undecidable manual P 336 0.2797 50 -0.4 90
IV.MMO1.EHZ. 2021-03-04T02:01:36.33 0.1 undecidable manual S 27 0.1331 127 -0.25 95
IV.MF5.EHZ. 2021-03-04T02:01:36.19 0.1 undecidable manual P 37 0.2599 50 0.11 96
IV.MC2.EHZ. 2021-03-04T02:01:36.93 0.1 undecidable manual S 343 0.1358 126 0.26 95
IV.MTRA.HNZ. 2021-03-04T02:01:35.72 0.1 undecidable manual S 102 0.1151 131 -0.32 94
IV.NRCA.HHZ. 2021-03-04T02:01:35.94 0.1 undecidable manual S 299 0.1079 132 0.1 99
IV.NRCA.HHZ. 2021-03-04T02:01:33.61 0.1 undecidable manual P 299 0.1079 132 0.16 97
IV.MMO1.EHZ. 2021-03-04T02:01:33.72 0.1 undecidable manual P 27 0.1331 127 -0.16 97
IV.MTRA.HNZ. 2021-03-04T02:01:33.89 0.1 undecidable manual P 102 0.1151 131 0.32 94
IV.MC2.EHZ. 2021-03-04T02:01:33.94 0.1 undecidable manual P 343 0.1358 126 0 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.8 7.56E-5 0.12 AML other m 2021-03-04T02:01:36.07
IV.NRCA.HHN. ML:0.9 8.645E-5 0.12 AML other m 2021-03-04T02:01:36.17
IV.NRCA.HNE. ML:0.9 8.110929E-5 0.1312 AML other m 2021-03-04T02:01:36.07
IV.FDMO.HHN. ML:0 4.08980945E-6 0.16 AML other m 2021-03-04T02:01:42.40
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