Earthquake with magnitude of ML 0.9 on date 07-08-2021 and time 19:57:55 (Italy) in region 2 km NW Amatrice (RI)

A magnitude ML 0.9 earthquake occured in region: 2 km NW Amatrice (RI), on

  • 07-08-2021 17:57:55 (UTC)
  • 07-08-2021 19:57:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.642, 13.273 at 9 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
Amatrice RI 2 2657 2657
Accumoli RI 6 667 3324
Cittareale RI 10 482 3806
Campotosto AQ 12 542 4348
Montereale AQ 13 2581 6929
Capitignano AQ 14 665 7594
Arquata del Tronto AP 15 1178 8772
Acquasanta Terme AP 18 2916 11688
Borbona RI 18 617 12305
Cortino TE 19 656 12961
Posta RI 19 694 13655
Crognaleto TE 20 1297 14952

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NW of L'Aquila (69753 inhabitants)
35 Km W of Teramo (54892 inhabitants)
52 Km E of Terni (111501 inhabitants)
58 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
80 Km W of Pescara (121014 inhabitants)
80 Km W of Chieti (51815 inhabitants)
84 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km NE of Tivoli (56533 inhabitants)
89 Km SE of Perugia (166134 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 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 0.9 2021-08-07
17:57:55
42.6418 13.2728 9 2021-08-07
18:12:20
Sala Sismica INGV-Roma 93810401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-07 17:57:55 ± 0.09
Latitude 42.6418 ± 0.0036
Longitude 13.2728 ± 0.0049
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 93810401

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 438
Semi-minor axis of confidence ellipse (meter) 334
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 135
Circular confidence region, given by single value of horizontal uncertainty (meter) 440
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27609
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 7
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 93810401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-07 18:12:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ZONE.HHZ. 2021-08-07T17:59:50.22 3.0 undecidable manual Sg 7.27 0
IV.ZEN8.EHZ. 2021-08-07T17:59:44.52 3.0 undecidable manual Sg 10.09 0
ST.RONC.HNZ. 2021-08-07T17:59:36.25 3.0 undecidable manual Sn -6.28 0
IT.LNT.HGZ. 2021-08-07T17:59:32.83 3.0 undecidable manual Pg 10.98 0
GU.GORR.HHZ. 2021-08-07T17:59:31.62 3.0 undecidable manual Sn -2.63 0
IV.PZUN.HHZ. 2021-08-07T17:59:22.10 3.0 undecidable manual Sg 1.66 0
GU.RRL.HHZ. 2021-08-07T17:59:19.54 3.0 undecidable manual Pn 3.96 0
CH.FUORN.HHZ. 2021-08-07T17:59:13.51 3.0 undecidable manual Pg 7.72 0
GU.MAIM.HHZ. 2021-08-07T17:59:13.72 3.0 undecidable manual Sg 6.28 0
IV.ECTS.HHZ. 2021-08-07T17:59:11.58 3.0 positive manual Pn -2.74 0
GU.MGRO.HHZ. 2021-08-07T17:59:01.75 3.0 undecidable manual Pn -0.27 0
IV.ORI.HHZ. 2021-08-07T17:58:50.76 3.0 positive manual Pn -3.88 0
IV.ZEN8.EHZ. 2021-08-07T17:58:48.07 3.0 undecidable manual Pn -3.84 0
IV.CMPR.HHZ. 2021-08-07T17:58:48.30 3.0 undecidable manual Pg 3.89 0
IV.NDIM.HNZ. 2021-08-07T17:58:41.69 3.0 positive manual Pn -0.87 0
IV.TST02.HHZ. 2021-08-07T17:58:36.06 3.0 undecidable manual S -2.87 0
IV.SEI.HHZ. 2021-08-07T17:58:27.03 3.0 negative manual Pn -4 0
IT.FIE.HGZ. 2021-08-07T17:58:25.47 3.0 undecidable manual Pn -3.83 0
IV.FAGN.HHZ. 2021-08-07T17:58:17.75 3.0 undecidable manual S -0.74 0
IV.CAMP.HHZ. 2021-08-07T17:58:11.22 3.0 undecidable manual S 0
IV.MC2.EHZ. 2021-08-07T17:58:06.38 0.3 undecidable manual S 347 0.2761 50 0.08 73
IV.CAMP.HHZ. 2021-08-07T17:58:05.34 3.0 undecidable manual P 0
IV.NRCA.HHZ. 2021-08-07T17:58:04.32 0.3 undecidable manual S 329 0.2239 111 -0.16 73
IV.LNSS.HNZ. 2021-08-07T17:58:02.87 0.3 undecidable manual S 257 0.1754 116 0.12 74
IV.RM33.EHZ. 2021-08-07T17:58:01.20 0.3 undecidable manual S 198 0.1394 121 -0.33 71
IV.MTRA.EHZ. 2021-08-07T17:58:01.49 0.3 undecidable manual S 38 0.1466 120 -0.27 72
IV.MC2.EHZ. 2021-08-07T17:58:01.85 0.6 undecidable manual P 347 0.2761 50 0.22 47
IV.NRCA.HHZ. 2021-08-07T17:58:00.51 0.3 undecidable manual P 329 0.2239 111 -0.07 74
IV.LNSS.HNZ. 2021-08-07T17:57:59.57 0.3 undecidable manual P 257 0.1754 116 -0.01 76
IV.SMA1.EHZ. 2021-08-07T17:57:59.05 0.3 undecidable manual S 104 0.0477 151 0.09 76
IV.RM33.EHZ. 2021-08-07T17:57:58.75 0.3 positive manual P 198 0.1394 121 -0.13 74
IV.MTRA.EHZ. 2021-08-07T17:57:58.93 0.1 undecidable manual P 38 0.1466 120 -0.08 100
IV.T1299.EHZ. 2021-08-07T17:57:58.68 0.3 undecidable manual S 138 0.0099 173 0.17 76
IV.SMA1.EHZ. 2021-08-07T17:57:57.53 0.3 negative manual P 104 0.0477 151 0.13 76
IV.T1299.EHZ. 2021-08-07T17:57:57.35 0.1 undecidable manual P 138 0.0099 173 0.21 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:1.3 0.00039 0.38 AML other m 2021-08-07T17:57:59.56
IV.SMA1.EHN. ML:1.1 0.0002065 0.36 AML other m 2021-08-07T17:57:59.42
IV.RM33.EHN. ML:0.8 6.07E-5 0.32 AML other m 2021-08-07T17:58:01.39
IV.MTRA.EHN. ML:1 9.99E-5 0.5 AML other m 2021-08-07T17:58:01.82
IV.RM33.EHE. ML:0.7 5.03E-5 0.86 AML other m 2021-08-07T17:58:01.44
IV.MTRA.EHE. ML:1 8.435E-5 0.56 AML other m 2021-08-07T17:58:02.03
IV.NRCA.HHN. ML:0.7 3.145E-5 0.5 AML other m 2021-08-07T17:58:04.23
IV.NRCA.HHE. ML:0.8 3.58E-5 1.02 AML other m 2021-08-07T17:58:04.71
IV.ZEN8.EHE. ML:2.8 3.935E-5 0.06 AML other m 2021-08-07T17:58:52.04
IV.ZEN8.EHN. ML:2.6 2.675E-5 0.06 AML other m 2021-08-07T17:58:52.14
IV.NDIM.HNE. ML:4 0.001095 0.08 AML other m 2021-08-07T17:58:55.36
IV.ZONE.HHN. ML:3.1 5.255E-5 0.18 AML other m 2021-08-07T17:59:22.91
IV.ZONE.HHE. ML:3.1 6.245E-5 0.22 AML other m 2021-08-07T17:59:23.75
IV.NDIM.HNN. ML:3.7 0.000618 0.22 AML other m 2021-08-07T17:59:42.58
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