Earthquake with magnitude of Md 2.0 on date 19-05-1987 and time 00:31:00 (Italy) in region 1 km SE Ciampino (RM)

A magnitude Md 2.0 earthquake occured in region: 1 km SE Ciampino (RM), on

  • 18-05-1987 22:31:00 (UTC)
  • 19-05-1987 00:31:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.8, 12.61 at 12 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
Ciampino RM 1 38412 38412
Grottaferrata RM 5 20327 58739
Marino RM 5 43026 101765
Frascati RM 6 22087 123852
Castel Gandolfo RM 7 8997 132849
Albano Laziale RM 9 41715 174564
Rocca di Papa RM 9 17034 191598
Monte Porzio Catone RM 9 8693 200291
Ariccia RM 10 19407 219698
Monte Compatri RM 11 11978 231676
Genzano di Roma RM 12 23970 255646
Nemi RM 12 1943 257589
Colonna RM 13 4287 261876
Rocca Priora RM 13 11962 273838
Roma RM 15 2864731 3138569
Lanuvio RM 15 13632 3152201
San Cesareo RM 16 15153 3167354
Pomezia RM 17 62966 3230320
Velletri RM 19 53303 3283623
Zagarolo RM 19 17843 3301466
Gallicano nel Lazio RM 20 6334 3307800

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km SE of Roma (2864731 inhabitants)
17 Km NE of Pomezia (62966 inhabitants)
19 Km NW of Velletri (53303 inhabitants)
23 Km N of Aprilia (73446 inhabitants)
24 Km SW of Tivoli (56533 inhabitants)
25 Km SW of Guidonia Montecelio (88673 inhabitants)
31 Km E of Fiumicino (78395 inhabitants)
39 Km N of Anzio (54211 inhabitants)
44 Km NW of Latina (125985 inhabitants)
75 Km E of Civitavecchia (52991 inhabitants)
81 Km SE of Viterbo (67173 inhabitants)
85 Km S of Terni (111501 inhabitants)
90 Km SW of L'Aquila (69753 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 2.0 1987-05-18
22:31:00
41.8 12.61 12 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 47299
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-18 22:31:00 ± 0.431
Latitude 41.80 ± 0.02
Longitude 12.61 ± 0.02
Depth (km) 12 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 47299

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) 3154.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 248
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.00057
Epicentral distance of station farthest from the epicenter (degree) 0.00526
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 47299
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:46:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1987-05-18T22:31:12.00 10.0 undecidable manual PG 5 0.0053 -0.06 1.1
--.CP9.Z. 1987-05-18T22:31:10.50 10.0 undecidable manual SG 75 0.0023 0.05 0.7
--.CP9.Z. 1987-05-18T22:31:06.00 10.0 undecidable manual PG 75 0.0023 -0.05 1.9
--.RMP.Z. 1987-05-18T22:31:04.50 10.0 undecidable manual SG 78 0.0006 -0.44 0.2
--.RMP.Z. 1987-05-18T22:31:03.50 10.0 undecidable manual PG 78 0.0006 0.63 0.4
--.RDP.Z. 1987-05-18T22:31:03.00 10.0 undecidable manual PG 116 0.0007 -0.09 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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