Earthquake with magnitude of Md 2.2 on date 21-04-1988 and time 00:56:00 (Italy) in region 6 km NW Cittareale (RI)

A magnitude Md 2.2 earthquake occured in region: 6 km NW Cittareale (RI), on

  • 20-04-1988 22:56:00 (UTC)
  • 21-04-1988 00:56:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.65, 13.09 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Cittareale RI 6 482 482
Cascia PG 10 3217 3699
Monteleone di Spoleto PG 12 599 4298
Posta RI 14 694 4992
Accumoli RI 14 667 5659
Leonessa RI 14 2435 8094
Poggiodomo PG 15 117 8211
Borbona RI 15 617 8828
Amatrice RI 16 2657 11485
Norcia PG 16 4957 16442
Montereale AQ 18 2581 19023

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Terni (111501 inhabitants)
41 Km NW of L'Aquila (69753 inhabitants)
47 Km SE of Foligno (57155 inhabitants)
50 Km W of Teramo (54892 inhabitants)
77 Km SE of Perugia (166134 inhabitants)
78 Km NE of Guidonia Montecelio (88673 inhabitants)
80 Km NE of Tivoli (56533 inhabitants)
85 Km E of Viterbo (67173 inhabitants)
88 Km W of Montesilvano (53738 inhabitants)
94 Km W of Pescara (121014 inhabitants)
94 Km W of Chieti (51815 inhabitants)
98 Km NE of Roma (2864731 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.2
ML-VAX 1.8
1988-04-20
22:56:00
42.65 13.09 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 66999
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1988-04-20 22:56:00 ± 0.092
Latitude 42.65 ± 0.01
Longitude 13.09 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 66999

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 882.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 160
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00332
Epicentral distance of station farthest from the epicenter (degree) 0.00874
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 66999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 18:03:22

ML:1.8

Field Value
Value 1.8
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 66999
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AM8.Z. 1988-04-20T22:56:35.75 10.0 undecidable manual SG! 22 0.0087 2.5 0
--.AM8.Z. 1988-04-20T22:56:19.75 10.0 undecidable manual PG 22 0.0087 0.53 0.2
--.ASS.Z. 1988-04-20T22:56:19.14 10.0 undecidable manual SG 322 0.0047 0.28 0.4
--.CM8.Z. 1988-04-20T22:56:19.66 10.0 undecidable manual SG 3 0.0049 0.07 0.6
--.SS8.Z. 1988-04-20T22:56:14.10 10.0 undecidable manual SG 15 0.0033 0.14 0.6
--.ALP.Z. 1988-04-20T22:56:14.15 10.0 undecidable manual SG 68 0.0033 0.23 0.4
--.MNS.Z. 1988-04-20T22:56:14.92 10.0 undecidable manual SG 229 0.0036 0.08 0.6
--.ASS.Z. 1988-04-20T22:56:10.85 10.0 undecidable manual PG 322 0.0047 -0.05 1.6
--.CM8.Z. 1988-04-20T22:56:10.99 10.0 negative manual PG 3 0.0049 -0.34 1.5
--.MNS.Z. 1988-04-20T22:56:08.50 10.0 undecidable manual PG 229 0.0036 -0.09 1.5
--.ALP.Z. 1988-04-20T22:56:07.89 10.0 positive manual PG 68 0.0033 -0.16 2.7
--.SS8.Z. 1988-04-20T22:56:07.79 10.0 undecidable manual PG 15 0.0033 -0.29 0.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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