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Reference on current condition of seismicity in the region of ?Northern Caucasus and its neighborhood?

According to the data of Geophysical Survey of RAS for the period from January 1 till April 25, 2000 more than 100 earthquakes with magnitude M more than 1.0-1.5 has taken place in the region of ?Northern Caucasus and its neighborhood?. 15 of them were felt in the settlements with force 2-3 and more MSK.

East part of Northern Caucasus This is the region mainly belonging to Dagestan Republic. Nearly 70% of all registered earthquakes of Caucasus have been happened here for this period. Four strongest earthquakes with magnitude Ms @ 4 has taken place here on January 28, March 21, April 12 and April 15. They belong to the same origin area which is located approximately in 50 km to the west from Makhachkala town. These earthquakes proceeded the process of seismic energy realization, which beginning was registered here in January 1999 (see “Reference on current condition of seismicity in the Caucasian region for the period from January 1 till August 11 1999” from 15.08.99.). The maximal strikes were noticed in towns Uchkent, Novy Chirkei, Dubki, Buinaksk and Kizilurt, where their value made about 4-5 MSK. Besides that seismic activity was observed in water area of Caspian sea and in coastal areas (territories of Dagestan, Azerbaijan). The strongest earthquake was registered on April 22 with magnitude M=4.4. Its maximum force was felt in Derbent town with value 4 MSK. Hypocenter of this event is dated to Karabogoz break having the order II. Series of weaker pushes stretching along the western coast of Caspian sea is dated to the Central-Caspian break of the I order. A number of earthquakes of East Caucasus is noticed in the frontier zone of Dagestan and Azerbaijan, where one can see some breaks of Caucasian spread on the map, including Kahetino- Lechumsky break of the first order. Western part of Northern Caucasus Significant seismic activity has been noticed here along the coastal part of Black Sea. Since February 29 a set from more than 20 earthquakes have taken place here, among them 6 had magnitude 2.7-3.3 and were felt on territory of Large Sochi with force up to 4-5 MSK. The strongest registered event happened on February 29 with magnitude 3.3, it was felt in Sochi with force 4-5 MSK, Adler 3-4 MSK, Lazarevskoye - 3-4 MSK and Dagomis - 2-3 MSK. Hypocenters of this set are located in a zone of crossing between Black Sea and Kahetino - Lechumsky breaks of the first order. Other sets of the earthquakes with intensity in hypocenter up to 7 MSK are known from historical records of this area. Last and most significant seismic set of the earthquakes was noticed in the area of Large Sochi in 1970-1971 with the main event having M=5.1 (December 4 1970). In April of this year a set of weak strikes with power class K=5 and less was registered by seismic station of Sochi. A rough site of this set - zone is Dagomis town, Baranovka settlement, approximately in 5-7 km from Dagomis and in 10 -12 km from Sochi town in mountain area. For the period from April 20 till April 25 about 20 strikes have taken place. The strikes were accompanied by underground rumble. Employees of seismic station Sochi and local staff of Extraodinary Events Ministry (EEM) carried out explanations among the population of settlement about correct behavior in case of at possible stronger earthquake. On April 6 the earthquake with magnitude 3.3 has taken place, which was felt in Novorossisk city with value 2-3 MSK, Gelendgik and Anapa - 2 MSK. Central part of Northern Caucasus In near to Caucasus region of Stavropol the local network of Kavminvody geodynamic area of GS RAS and geophysical complex of “Gofitskoye” point registered seismic activity in tectonic zone of Stavropol arch at Roshevatsky break of the II-nd order. For the period from April 24 till April 25 three strikes with magnitude 2.8-2.9 were registered. From data of Stavropol center of EEM the strongest of them was felt in Rizdviyany settlement with force up to 3-4 MSK. In zone of Kavminvody geodynamic area of GS RAS the weak seismicity is still observed in area of junction between Cherkessk and Armaviro-Essentuky breaks of the 1-st order. These are the main characteristics of seismic activity in Northern Caucasus for the period from January 1 till April 25, 2000. OPERATIVE SEISMOLOGICAL CATALOGUE of “Northern Caucasus and its neighborhood” region January 1 - April 25, 2000 General parameters of hypocenter

N	DATE				LAT	LONG	H	K	Data source
	yy mm dd	hour	min	sec	degr	degr	km	K	Data source
	1				2		3	4	5
1	20000101	21	09	8.5	43.40	43.88	27	7.8	1
2	20000102	05	53	2.5	43.11	46.98	9	8.2	2
3	20000102	15	58	49.4	42.71	47.10	10	8.6	1
4	20000102	23	08	1.1	41.83	45.20	15	9.9	1
5	20000104	10	10	33.9	43.07	47.00	6	8.1	1
6	20000104	15	09	36.3	43.14	47.02	7	8.9	1
7	20000104	18	05	31.1	43.74	45.31	19	8.7	1
8	20000106	06	24	44.9	42.92	45.28	24	8.8	1
9	20000108	18	33	16.8	42.95	45.22	24	9.9	1, operative seismological catalogue
10	20000108	20	15	43.4	41.92	49.06	50	8.9	2
11	20000111	21	58	04.0	43.12	46.98	4	6.9	2
12	20000112	17	41	30.5	42.88	47.18	10	6.1	2
13	20000116	10	52	44.1	43.00	46.84	13	8.6	1
14	20000117	06	10	36.3	42.89	46.78	2	7.2	2
15	20000121	20	26	02.5	42.56	46.17	5	8.0	2
16	20000122	22	49	52.0	42.87	46.807	4	7.0	2
17	20000124	14	30	29.1	42.86	46.37	2	7.6	2
18	20000125	04	13	21.2	43.02	47.00	11	8.3	1
19	20000126	23	00	20.3	39.99	52.91	35	13.0	Alert Service, operative seismological catalogue
20	20000128	03	29	17.7	37.67	49.07	33	9.5	operative seismological catalogue
21	20000128	23	27	9.8	43.03	47.00	14	10.0	Alert Service, 1
22	20000129	22	58	26.1	43.01	47.00	11	7.6	1
23	20000131	00	31	17.6	42.86	46.80	24	7.4	2
24	20000131	01	44	59.0	42.91	46.85	8	6.1	2
25	20000202	22	02	18.6	43.01	42.32	1	9.4	1
26	20000204	22	36	52.8	44.07	42.81	11	8.4	1
27	20000204	22	41	00.1	44.01	42.79	12	7.4	1
28	20000205	19	19	49.2	42.74	46.15	1	8.9	1
29	20000206	05	13	03.1	43.39	42.70	51	5.9	1
30	20000206	16	44	13.9	42.83	46.95	6	8.1	1
31	20000209	04	54	42.8	42.50	43.25	1	10.2	1
32	20000210	09	37	31.2	41.83	46.92	23	9.1	2, operative seismological catalogue
33	20000210	18	31	27.7	42.43	45.13	20	9.0	1
34	20000211	19	20	24.3	42.90	46.80	13	7.2	2
35	20000212	18	04	55.9	42.81	44.21	12	6.3	1
36	20000213	09	27	07.7	41.19	48.70	50	8.8	2
37	20000213	14	42	21.4	41.56	48.39	37	8.8	2
38	20000213	21	30	20.4	43.58	43.90	43	6.7	1
39	20000214	19	50	28.1	43.11	47.02	13	6.5	2
40	20000215	00	47	57.3	43.08	47.03	6	6.8	2
41	20000215	05	55	44.3	42.90	46.49	15	8.0	1
42	20000216	08	38	53.4	39.47	43.92	10	9.9	1
43	20000216	17	25	48.2	44.10	42.66	19	7.3	3
44	20000216	20	01	12.6	41.99	45.96	20	7.9	1
45	20000218	04	05	30.6	42.45	46.43	48	8.2	2
46	20000219	17	00	23.4	42.89	46.39	46	8.3	1
47	20000223	03	29	2.8	43.38	44.44	14	7.7	1
48	20000223	08	21	37.6	42.55	46.09	32	8.8	1, operative seismological catalogue
49	20000224	05	30	51.3	43.20	45.43	54	7.6	1
50	20000224	23	02	14.3	43.19	45.24	56	7.3	1
51	20000225	09	46	33.9	44.25	43.13	12	6.6	1
52	20000227	13	26	17.4	42.68	43.83	48	8.3	1
53	20000228	06	53	34.3	43.11	47.06	8	7.5	2
54	20000229	01	34	20.8	42.93	47.28	9	8.9	1
55	20000229	01	38	9.0	42.93	47.27	9	7.4	2
56	20000229	01	39	32.3	42.99	47.26	12	8.6	2
57	20000229	02	06	30.4	42.94	47.27	12	7.0	2
58	20000229	08	55	42.8	43.42	39.57	7	10.8	Alert Service, 1, operative seismological catalogue
59	20000229	13	09	23.9	42.83	46.33	14	8.2	1
60	20000229	13	22	23.4	43.44	39.51	2	9.8	Alert Service, 1, operative seismological catalogue
61	20000301	11	25	10.0	43.67	45.47	60	8.7	1
62	20000301	19	38	52.6	41.58	47.75	20	7.7	2
63	20000302	06	55	38.8	43.58	39.73	10	9.2	Alert Service, 1
64	20000302	10	32	21.4	43.48	44.92	4	9.3	1, operative seismological catalogue
65	20000302	10	51	43.8	43.13	47.03	18	7.3	2
66	20000302	11	17	41.5	42.95	47.42	13	7.3	1
67	20000302	15	37	42.3	43.67	44.82	53	8.1	1
68	20000304	01	45	54.3	43.10	46.19	9	8.5	1
69	20000305	08	36	17.4	43.03	46.03	75	7.6	1
70	20000307	00	21	26.5	43.48	41.35	3	10.3	1
71	20000307	14	22	52.5	43.18	46.12	13	8.9	1, operative seismological catalogue
72	20000308	01	04	35.7	42.13	48.64	34	9.7	1, operative seismological catalogue
73	20000308	01	45	53.6	41.10	51.90	33	10.7	Alert Service, operative seismological catalogue
74	20000308	16	44	19.8	43.48	45.65	9	9.5	1, operative seismological catalogue
75	20000308	18	56	7.6	43.69	39.60	6	9.6	1
76	20000309	14	29	40.7	40.76	47.73	33	9.5	operative seismological catalogue
77	20000310	01	22	32.4	42.51	47.88	32	9.5	1, operative seismological catalogue
78	20000310	14	20	33.0	41.03	48.17	20	11.6	1
79	20000310	22	35	23.8	43.44	39.58	3	8.5	1, operative seismological catalogue
80	20000310	22	57	46.4	43.58	39.57	6	10.0	Alert Service, 1, operative seismological catalogue
81	20000311	00	31	05.0	43.12	47.23	40	7.0	2
82	20000312	18	01	56.7	43.09	46.76	43	7.6	2
83	20000314	02	37	59.6	42.27	46.78	1	7.7	2
84	20000318	22	10	44.3	43.79	43.00	10	7.3	3
85	20000319	07	20	34.4	43.35	41.39	1	9.8	3
86	20000319	11	05	54.3	43.33	41.42	15	6.5	3
87	20000323	23	00	22.3	43.88	43.12	18	8.7	3
88	20000321	14	07	36.7	40.70	47.31	1	11.5	Alert Service
89	20000322	11	45	43.5	42.63	46.94	10	5.8	2
90	20000325	00	13	18.2	41.57	47.64	36	8.2	2
91	20000326	13	30	45.4	42.47	46.36	50	9.0	2
92	20000327	01	34	07.5	42.95	47.02	20	7.8	2
93	20000327	21	9	11.43	44.28	42.66	12	7.6	3
94	20000328	15	00	27.3	42.90	47.10	46	7.2	2
95	20000401	01	58	41.5	44.02	42.79	12	6.9	3
96	20000401	09	45	30.1	44.02	42.79	12	7.5	3
97	20000401	12	32	20.3	43.07	46.96	30	8.7	2
98	20000406	13	25	33.3	44.29	37.60	40	10.0	Alert Service
99	20000407	02	46	49.1	43.07	47.12	48	9.7	3, Alert Service
100	20000407	11	48	42.1	43.13	47.05	35	7.9	2
101	20000410	03	43	08.1	40.71	48.36	33	10.7	Alert Service
102	20000411	07	41	18.7	44.08	42.82	15	4.6	3
103	20000412	00	01	30.5	42.81	47.04	25	11.5	Alert Service
104	20000413	00	07	07.0	43.70	39.70	15	9.5	Alert Service
105	20000415	07	15	20.8	42.96	47.05	20	11.0	Alert Service
106	20000422	08	46	36.6	42.73	49.13	33	11.9	Alert Service
107	20000422	15	53	30.5	43.60	39.65	33	9.5	Alert Service
108	20000424	04	57	22.1	45.20	41.82	10	9.2	3
109	20000424	11	50	07.8	45.18	41.75	9	9.1	3
110	20000425	00	56	56.7	45.24	41.85	8	9.3	3

1 - North-Caucasian regional catalogue 2 - Catalogue of Dagestan 3 - Local Seismic Network of Kavminvody geodynamics test area

Figure 1