<p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在巖石圈下層塑性流動(dòng)</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><a href="http://www.njsywl.com/"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";" lang="EN-US"><span lang="EN-US"><span style="color: #800080;">網(wǎng)帶</span></span></span></a></span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的控制下，導致地震震中的條帶狀分布，形成與塑性流動(dòng)網(wǎng)帶相對應的大型地震帶。因此，塑性流動(dòng)<strong><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">網(wǎng)帶</span></strong>可視為位于多震層之下的控震構造帶。多震層內的發(fā)震斷裂（或稱(chēng)震源斷裂），其走向多數與網(wǎng)帶走向不一致，但它們沿網(wǎng)帶斷續排列，構成地震斷裂帶，或成地震構造帶。類(lèi)似地，淺層地殼的斷裂，沿網(wǎng)帶排列，也表現為地震斷裂帶或構造帶。通常所指的</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">“</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">變新地震構造帶</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">”</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">也就是受現在塑性流動(dòng)網(wǎng)帶控制的地震構造帶。</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><br /></span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">震源構造為地震的孕育和發(fā)生提供直接的構造條件，控震構造則為地震的孕育和發(fā)生提供驅動(dòng)力源和能量背景條件�？刂菩院驼{節性構造都可能成為控震構造。而其中較有普遍意義和主要作用的則是巖石圈下層的塑性流動(dòng)網(wǎng)帶。溯溪</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">ing</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">流動(dòng)網(wǎng)帶的控震作用主要體現在以下兩個(gè)方面：</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><br />    1)</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、導致多震層內地震活動(dòng)沿網(wǎng)帶分布</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><br />    </span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">塑性流動(dòng)網(wǎng)帶的剪切變形及其向上的拽引傳遞，在上方多震層中形成應變相對集中的</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">”</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">能量網(wǎng)帶</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">“</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">，致使地震活動(dòng)及震源鍛煉沿此</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">”</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">能量網(wǎng)帶</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">“</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">分布，呈現為大型地震帶，從而在板塊內部形成</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">”</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">塑性流動(dòng)</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">——</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">地震</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">“</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">雙層網(wǎng)絡(luò )系統。沿</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">”</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">能量網(wǎng)帶</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">“</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">斷續分布的震源斷裂則構成與網(wǎng)帶想對應的地震構造帶。大型地震帶和地震構造帶都是多震層對巖石圈下層塑性流動(dòng)網(wǎng)帶走滑剪切變形的響應和顯示。隨著(zhù)時(shí)間的斷續，大型地震帶內的地震分布由稀疏到稠密，響應的，地震構造帶由萌生到成素，表現為孔雀段累計長(cháng)度的逐漸縮小和斷裂累計長(cháng)度的逐漸加大。</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><br />    2)</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、限定震源斷裂走向的分布范圍</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"><br />    </span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">震源斷裂可以是對先存斷裂的繼承和改造，也可以是變新的斷裂，然而，無(wú)論繼承、改造或者變新，震源斷裂的走向必然符合可能錯動(dòng)的條件，即要求非常大主壓應力對斷裂的作用方向適宜于錯動(dòng)，具體的表現為錯位角不超出允許的范圍（不僅有于</span><span style="color: #444444; font-size: 9pt;" lang="EN-US">45</span><span style="font-family: 宋體; color: #444444; font-size: 9pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">度）。同事，多震層內的非常大主壓應力方向在總體確實(shí)主要取決于塑性流動(dòng)網(wǎng)帶的去向。因此，震源斷裂的走向、錯動(dòng)角與網(wǎng)帶走向三者之間保持著(zhù)某種聯(lián)系，并決定著(zhù)斷斷裂和網(wǎng)帶的走向交角被限定在一定的范圍內。</span><span style="color: #444444; font-size: 9pt;" lang="EN-US"></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="color: #444444; font-size: 9pt;" lang="EN-US"> </span></p> <p><span style="font-family: 宋體; font-size: 12pt; mso-bidi-font-family: 宋體; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">本文轉載自寧津勝陽(yáng)網(wǎng)鏈有限公司<span lang="EN-US"><a href="http://www.njsywl.com/"><span style="color: #800080;">http://www.njsywl.com</span></a></span></span></p>